remove feature_id from ExpressionLevel

[saupchurch]

remove feature_id from ExpressionLevel and changes search to filter by name
depends on:
ga4gh/ga4gh-schemas#829

[ejacox]

+1

[david4096]

@saupchurch thanks for taking a look at this! Once the tests are updated I think it will be ready to merge!

[saupchurch]

@david4096 thanks. I should have updated test shortly.

[kozbo]

closes #1580

[ejacox]

I removed an unused parameter that was causing one test to fail. The tests pass. However, the constraints file pointing to the correct schemas and client wasn't checked in, so travis is failing here.

[codecov-io]

Codecov Report

Merging #1574 into master will increase coverage by 0.13%.
The diff coverage is 84.61%.

@@            Coverage Diff             @@
##           master    #1574      +/-   ##
==========================================
+ Coverage   85.78%   85.91%   +0.13%     
==========================================
  Files          34       34              
  Lines        7511     7489      -22     
  Branches      944      938       -6     
==========================================
- Hits         6443     6434       -9     
+ Misses        868      857      -11     
+ Partials      200      198       -2

Impacted Files	Coverage Δ
ga4gh/server/paging.py	90.57% <ø> (ø)	✅
ga4gh/server/datamodel/rna_quantification.py	89.79% <100%> (-0.13%)	❌
ga4gh/server/repo/rnaseq2ga.py	65.88% <75%> (+3.44%)	✅

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