List cards

[bond15]

Adds the functionality to list cards in a project by column id.

[codecov]

Codecov Report

Merging #364 into master will increase coverage by 0.17%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #364      +/-   ##
==========================================
+ Coverage   92.64%   92.81%   +0.17%     
==========================================
  Files          23       23              
  Lines         530      543      +13     
  Branches        1        1              
==========================================
+ Hits          491      504      +13     
  Misses         39       39

Impacted Files	Coverage Δ
...la/github4s/interpreters/ProjectsInterpreter.scala	100% <100%> (ø)	⬆️
github4s/src/main/scala/github4s/Decoders.scala	90.9% <100%> (+0.06%)	⬆️
.../scala/github4s/interpreters/AuthInterpreter.scala	100% <0%> (ø)	⬆️

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[anamariamv]

👍

[BenFradet]

👍

[bond15]

I think we may be triggering at 403 in the integrations tests by giving the wrong credentials too many times to the Auth api.

https://developer.github.com/v3/#authentication

Also, the integrations tests are sensitive to the remove label test. Not sure if this is a race condition between creating a label and then deleting it immediately.