Add explicit Id instances for Kleisli

[ceedubs]

Fixes #580.

[codecov-io]

Current coverage is 76.22%

Merging #621 into master will not affect coverage as of 57ab26c

@@            master    #621   diff @@
======================================
  Files          159     159       
  Stmts         2074    2078     +4
  Branches        69      69       
  Methods          0       0       
======================================
+ Hit           1581    1584     +3
  Partial          0       0       
- Missed         493     494     +1

Review entire Coverage Diff as of 57ab26c

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[adelbertc]

👍

[non]

👍 but needs a re-merge

[ceedubs]

Thanks @non. Updated.