Don't pluralize model names not ending with letters

[refack]

Closes #1703

[ebensing]

Benchmarks for f3e8ba6:
insert

Insert - Mongoose - Basic x 399 ops/sec ±5.88% (75 runs sampled)
Insert - Driver - Basic x 567 ops/sec ±7.30% (88 runs sampled)
Insert - Mongoose - Embedded Docs x 103 ops/sec ±9.15% (54 runs sampled)
Insert - Driver - Embedded Docs x 522 ops/sec ±1.61% (86 runs sampled)

delete

Delete - Mongoose x 568 ops/sec ±4.61% (85 runs sampled)
Delete - Driver x 626 ops/sec ±0.95% (82 runs sampled)

update

Update - Mongoose - Basic x 513 ops/sec ±4.20% (87 runs sampled)
Update - Driver - Basic x 584 ops/sec ±1.60% (88 runs sampled)
Update - Mongoose - Embedded Docs x 91.62 ops/sec ±7.92% (53 runs sampled)
Update - Driver - Embdedded Docs x 420 ops/sec ±2.69% (81 runs sampled)
Update - Mongoose - Multiple Documents x 302 ops/sec ±6.55% (74 runs sampled)
Update - Driver - Multiple Documents x 518 ops/sec ±2.03% (88 runs sampled)
Update - Mongoose - pop and push x 30.49 ops/sec ±16.44% (44 runs sampled)
Update - Mongoose - Array Manipulation, parallel ops x 296 ops/sec ±4.61% (79 runs sampled)
Update - Mongoose - findOneAndModify x 257 ops/sec ±10.31% (62 runs sampled)
Update - Mongoose - find and update, separate ops x 254 ops/sec ±8.15% (63 runs sampled)

read

Read - Mongoose - Basic x 439 ops/sec ±48.63% (87 runs sampled)
Read - Driver - Basic x 678 ops/sec ±0.99% (87 runs sampled)
Read - Mongoose - With lean x 605 ops/sec ±2.34% (85 runs sampled)
Read - Mongoose - Multiple Items x 152 ops/sec ±6.79% (58 runs sampled)
Read - Driver - Multiple Items x 477 ops/sec ±3.27% (82 runs sampled)
Read - Mongoose - Non-index x 190 ops/sec ±7.50% (59 runs sampled)
Read - Driver - Non-index x 422 ops/sec ±2.82% (85 runs sampled)
Read - Mongoose - Embedded Docs x 284 ops/sec ±7.52% (66 runs sampled)
Read - Driver - Embedded Docs x 655 ops/sec ±1.53% (86 runs sampled)

casting

Casting - Embedded Docs - 0 Docs x 2,978 ops/sec ±8.74% (49 runs sampled)
Casting - Embedded Docs - 10 Docs x 3,127 ops/sec ±8.78% (47 runs sampled)
Casting - Embedded Docs - 100 Docs x 2,909 ops/sec ±8.90% (47 runs sampled)
Casting - Embedded Docs - 1000 Docs x 1,754 ops/sec ±11.85% (39 runs sampled)
Casting - Embedded Docs - 10000 Docs x 509 ops/sec ±9.23% (46 runs sampled)

population

Populate - 1 value x 519 ops/sec ±3.52% (85 runs sampled)
Populate - 10 values x 338 ops/sec ±6.08% (76 runs sampled)
Populate - 100 values x 66.21 ops/sec ±7.27% (50 runs sampled)
Populate - 1000 values x 11.83 ops/sec ±6.30% (32 runs sampled)
Populate - 10000 values x 3.12 ops/sec ±5.01% (20 runs sampled)
Populate - 5 properties x 12.16 ops/sec ±7.48% (47 runs sampled)
Populate - 10 properties x 9.06 ops/sec ±8.22% (47 runs sampled)

multiop

Multi-Op - Mongoose - Heavy Read, low write x 7.12 ops/sec ±4.62% (39 runs sampled)
Multi-Op - Driver - Heavy Read, low write x 13.09 ops/sec ±4.81% (54 runs sampled)
Multi-Op - Mongoose - Embedded Docs - Heavy Read, low write x 1.72 ops/sec ±11.93% (13 runs sampled)
Multi-Op - Driver - Embedded Docs - Heavy Read, low write x 10.49 ops/sec ±5.01% (52 runs sampled)
Multi-Op - Mongoose - Heavy Write, low read x 4.15 ops/sec ±7.67% (24 runs sampled)
Multi-Op - Driver - Heavy Write, low read x 8.39 ops/sec ±3.71% (43 runs sampled)
Multi-Op - Mongoose - Embedded Docs - Heavy Write, low read x 0.60 ops/sec ±10.24% (7 runs sampled)
Multi-Op - Driver - Embedded Docs - Heavy Write, low read x 5.31 ops/sec ±3.54% (30 runs sampled)
Multi-Op - Mongoose - Embedded Docs - Read-write-update x 1.33 ops/sec ±5.36% (11 runs sampled)
Multi-Op - Driver - Embedded Docs - Read-write-update x 8.13 ops/sec ±5.33% (42 runs sampled)

[ebensing]

Benchmarks for bc75c5b:
insert

Insert - Mongoose - Basic x 281 ops/sec ±56.27% (74 runs sampled)
Insert - Driver - Basic x 585 ops/sec ±2.88% (86 runs sampled)
Insert - Mongoose - Embedded Docs x 102 ops/sec ±9.21% (54 runs sampled)
Insert - Driver - Embedded Docs x 497 ops/sec ±6.57% (82 runs sampled)

delete

Delete - Mongoose x 578 ops/sec ±3.05% (85 runs sampled)
Delete - Driver x 609 ops/sec ±0.81% (87 runs sampled)

update

Update - Mongoose - Basic x 470 ops/sec ±4.78% (81 runs sampled)
Update - Driver - Basic x 556 ops/sec ±2.85% (82 runs sampled)
Update - Mongoose - Embedded Docs x 85.47 ops/sec ±9.80% (49 runs sampled)
Update - Driver - Embdedded Docs x 395 ops/sec ±4.08% (80 runs sampled)
Update - Mongoose - Multiple Documents x 259 ops/sec ±6.69% (69 runs sampled)
Update - Driver - Multiple Documents x 466 ops/sec ±5.99% (81 runs sampled)
Update - Mongoose - pop and push x 29.27 ops/sec ±10.53% (53 runs sampled)
Update - Mongoose - Array Manipulation, parallel ops x 265 ops/sec ±5.96% (72 runs sampled)
Update - Mongoose - findOneAndModify x 279 ops/sec ±7.77% (65 runs sampled)
Update - Mongoose - find and update, separate ops x 255 ops/sec ±9.75% (64 runs sampled)

read

Read - Mongoose - Basic x 593 ops/sec ±1.52% (87 runs sampled)
Read - Driver - Basic x 689 ops/sec ±1.06% (89 runs sampled)
Read - Mongoose - With lean x 621 ops/sec ±1.89% (87 runs sampled)
Read - Mongoose - Multiple Items x 156 ops/sec ±6.10% (56 runs sampled)
Read - Driver - Multiple Items x 484 ops/sec ±4.15% (83 runs sampled)
Read - Mongoose - Non-index x 211 ops/sec ±5.96% (63 runs sampled)
Read - Driver - Non-index x 457 ops/sec ±0.70% (80 runs sampled)
Read - Mongoose - Embedded Docs x 318 ops/sec ±6.55% (72 runs sampled)
Read - Driver - Embedded Docs x 660 ops/sec ±0.92% (86 runs sampled)

casting

Casting - Embedded Docs - 0 Docs x 3,194 ops/sec ±8.58% (53 runs sampled)
Casting - Embedded Docs - 10 Docs x 3,333 ops/sec ±9.02% (52 runs sampled)
Casting - Embedded Docs - 100 Docs x 2,918 ops/sec ±9.30% (48 runs sampled)
Casting - Embedded Docs - 1000 Docs x 1,831 ops/sec ±10.96% (40 runs sampled)
Casting - Embedded Docs - 10000 Docs x 498 ops/sec ±12.54% (39 runs sampled)

population

Populate - 1 value x 512 ops/sec ±5.25% (86 runs sampled)
Populate - 10 values x 351 ops/sec ±5.72% (76 runs sampled)
Populate - 100 values x 60.61 ops/sec ±7.77% (51 runs sampled)
Populate - 1000 values x 10.42 ops/sec ±7.47% (35 runs sampled)
Populate - 10000 values x 3.06 ops/sec ±5.30% (19 runs sampled)
Populate - 5 properties x 11.91 ops/sec ±7.02% (36 runs sampled)
Populate - 10 properties x 9.37 ops/sec ±7.12% (48 runs sampled)

multiop

Multi-Op - Mongoose - Heavy Read, low write x 6.93 ops/sec ±6.52% (38 runs sampled)
Multi-Op - Driver - Heavy Read, low write x 12.79 ops/sec ±3.87% (46 runs sampled)
Multi-Op - Mongoose - Embedded Docs - Heavy Read, low write x 1.49 ops/sec ±13.28% (11 runs sampled)
Multi-Op - Driver - Embedded Docs - Heavy Read, low write x 10.17 ops/sec ±5.10% (51 runs sampled)
Multi-Op - Mongoose - Heavy Write, low read x 4.32 ops/sec ±6.16% (25 runs sampled)
Multi-Op - Driver - Heavy Write, low read x 8.19 ops/sec ±3.59% (43 runs sampled)
Multi-Op - Mongoose - Embedded Docs - Heavy Write, low read x 0.58 ops/sec ±10.21% (7 runs sampled)
Multi-Op - Driver - Embedded Docs - Heavy Write, low read x 5.00 ops/sec ±2.39% (29 runs sampled)
Multi-Op - Mongoose - Embedded Docs - Read-write-update x 1.32 ops/sec ±5.15% (11 runs sampled)
Multi-Op - Driver - Embedded Docs - Read-write-update x 8.23 ops/sec ±3.81% (43 runs sampled)

[ebensing]

Benchmarks for d079116:
insert

Insert - Mongoose - Basic x 407 ops/sec ±5.91% (76 runs sampled)
Insert - Driver - Basic x 581 ops/sec ±4.22% (85 runs sampled)
Insert - Mongoose - Embedded Docs x 107 ops/sec ±7.83% (56 runs sampled)
Insert - Driver - Embedded Docs x 507 ops/sec ±4.95% (83 runs sampled)

delete

Delete - Mongoose x 579 ops/sec ±1.90% (87 runs sampled)
Delete - Driver x 620 ops/sec ±0.88% (88 runs sampled)

update

Update - Mongoose - Basic x 520 ops/sec ±3.47% (85 runs sampled)
Update - Driver - Basic x 593 ops/sec ±1.28% (87 runs sampled)
Update - Mongoose - Embedded Docs x 92.07 ops/sec ±8.73% (55 runs sampled)
Update - Driver - Embdedded Docs x 439 ops/sec ±1.75% (88 runs sampled)
Update - Mongoose - Multiple Documents x 258 ops/sec ±35.24% (70 runs sampled)
Update - Driver - Multiple Documents x 484 ops/sec ±3.87% (82 runs sampled)
Update - Mongoose - pop and push x 30.59 ops/sec ±13.06% (55 runs sampled)
Update - Mongoose - Array Manipulation, parallel ops x 279 ops/sec ±5.23% (74 runs sampled)
Update - Mongoose - findOneAndModify x 277 ops/sec ±8.26% (65 runs sampled)
Update - Mongoose - find and update, separate ops x 267 ops/sec ±8.98% (65 runs sampled)

read

Read - Mongoose - Basic x 586 ops/sec ±1.85% (84 runs sampled)
Read - Driver - Basic x 687 ops/sec ±0.97% (88 runs sampled)
Read - Mongoose - With lean x 622 ops/sec ±0.93% (88 runs sampled)
Read - Mongoose - Multiple Items x 152 ops/sec ±6.89% (56 runs sampled)
Read - Driver - Multiple Items x 479 ops/sec ±4.54% (83 runs sampled)
Read - Mongoose - Non-index x 189 ops/sec ±7.22% (59 runs sampled)
Read - Driver - Non-index x 437 ops/sec ±1.84% (87 runs sampled)
Read - Mongoose - Embedded Docs x 296 ops/sec ±7.34% (68 runs sampled)
Read - Driver - Embedded Docs x 649 ops/sec ±1.51% (83 runs sampled)

casting

Casting - Embedded Docs - 0 Docs x 2,824 ops/sec ±9.43% (47 runs sampled)
Casting - Embedded Docs - 10 Docs x 2,992 ops/sec ±10.34% (47 runs sampled)
Casting - Embedded Docs - 100 Docs x 2,866 ops/sec ±9.65% (47 runs sampled)
Casting - Embedded Docs - 1000 Docs x 1,870 ops/sec ±10.69% (42 runs sampled)
Casting - Embedded Docs - 10000 Docs x 453 ops/sec ±11.93% (44 runs sampled)

population

Populate - 1 value x 510 ops/sec ±3.95% (86 runs sampled)
Populate - 10 values x 312 ops/sec ±6.01% (62 runs sampled)
Populate - 100 values x 61.06 ops/sec ±7.07% (51 runs sampled)
Populate - 1000 values x 10.79 ops/sec ±8.80% (35 runs sampled)
Populate - 10000 values x 3.18 ops/sec ±5.02% (20 runs sampled)
Populate - 5 properties x 11.93 ops/sec ±6.59% (41 runs sampled)
Populate - 10 properties x 9.39 ops/sec ±6.53% (49 runs sampled)

multiop

Multi-Op - Mongoose - Heavy Read, low write x 7.31 ops/sec ±6.36% (40 runs sampled)
Multi-Op - Driver - Heavy Read, low write x 13.08 ops/sec ±5.32% (47 runs sampled)
Multi-Op - Mongoose - Embedded Docs - Heavy Read, low write x 1.76 ops/sec ±8.00% (13 runs sampled)
Multi-Op - Driver - Embedded Docs - Heavy Read, low write x 10.37 ops/sec ±3.58% (52 runs sampled)
Multi-Op - Mongoose - Heavy Write, low read x 4.44 ops/sec ±5.94% (26 runs sampled)
Multi-Op - Driver - Heavy Write, low read x 8.28 ops/sec ±3.66% (43 runs sampled)
Multi-Op - Mongoose - Embedded Docs - Heavy Write, low read x 0.61 ops/sec ±7.35% (8 runs sampled)
Multi-Op - Driver - Embedded Docs - Heavy Write, low read x 5.46 ops/sec ±3.95% (31 runs sampled)
Multi-Op - Mongoose - Embedded Docs - Read-write-update x 1.40 ops/sec ±5.03% (11 runs sampled)
Multi-Op - Driver - Embedded Docs - Read-write-update x 8.24 ops/sec ±3.89% (42 runs sampled)

[aheckmann]

merged! thanks. this will go into 3.7.x