Add getOrElseF method to XorT

[easel]

No description provided.

[easel]

@ceedubs per gitter discussion, here's a first attempt at an implementation + test for XorT.getOrElseF

[codecov-io]

Current coverage is 85.02%

Merging #705 into master will increase coverage by +0.02% as of 0549329

@@            master    #705   diff @@
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  Files          162     162       
  Stmts         2228    2230     +2
  Branches        74      74       
  Methods          0       0       
======================================
+ Hit           1894    1896     +2
  Partial          0       0       
  Missed         334     334       

Review entire Coverage Diff as of 0549329

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[adelbertc]

👍

[ceedubs]

Extremely minor: I'd be inclined to use the following names for the captured values:

case Xor.Left(_) => default
case Xor.Right(b) => F.pure(b)

As this doesn't actually result in any difference, I'm not sure I can really justify the nitpick though...

[ceedubs]

👍

[easel]

Easy enough to change. Update incoming.

[easel]

I'm pretending I didn't read the contributing file and force pushing the change anyway. Match parameters now updated per @ceedubs suggestion.

[ceedubs]

Thanks!

[easel]

Cool, thanks for the help!