Upgrade to v0.7 and test organization

[mohamed82008]

This PR upgrades the package to v0.7 and does some re-organization of the tests, no functional change. The following is the test result now on my machine with 4 threads.

   Testing KissThreading
 Resolving package versions...
--------
tmap!
  5.181783 seconds (2.50 M allocations: 6.239 GiB, 26.16% gc time)
simple
  4.539470 seconds (4.43 M allocations: 6.178 GiB, 18.73% gc time)
Test Summary:  | Pass  Total
bootstrap test |    2      2
--------
tmap!
  5.758912 seconds (75.22 k allocations: 11.480 MiB)
simple
  6.008049 seconds (67.87 k allocations: 10.969 MiB)
Test Summary: | Pass  Total
bubblesort    |    2      2
--------
tmap!
  1.716371 seconds (209.28 k allocations: 772.499 MiB, 2.42% gc time)
simple
  1.617466 seconds (69.59 k allocations: 765.968 MiB)
Test Summary: | Pass  Total
sort_batch    |    2      2
--------
threaded
  0.040570 seconds (16 allocations: 384 bytes)
unthreaded
  0.127004 seconds (5 allocations: 176 bytes)
Test Summary:       | Pass  Total
summation: getrange |    1      1
========
   Testing KissThreading tests passed

[bkamins]

Thanks. Looks good, but I will review it in a few days and merge.

The only comment is that I will redesign the random number generation part to avoid NUMA issues (to make sure that each thread allocates its own PRNGs and there will be no need of droping one). But this is for later (and as noted in #1 if 0.7 is bad with Atomic probably introduce processing in batches).

[bkamins]

Thanks!