UIOperation does not finish

[danthorpe]

UIOperation does not actually finish after it does the presentation. But it does accept a completion block. This is all a bit strange. There is no need for a completion block, and instead, it should just finish().

[codecov-io]

Current coverage is 74.30%

Merging #186 into development will increase coverage by +0.01% as of b409689

@@            development   #186   diff @@
==========================================
  Files                51     51       
  Stmts              3240   3242     +2
  Branches              0      0       
  Methods                              
==========================================
+ Hit                2407   2409     +2
  Partial               0      0       
  Missed              833    833       

Review entire Coverage Diff as of b409689

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