Added user interaction to animation

[ivanbruel]

When using Kingfisher with any type of animation, it was just breaking user interaction and not allowing users to scroll through lists on interact with the UIImageViews themselves.

This was mostly due to the fact that .AllowUserInteraction was not an option on the UIView.transitionWithView call.

[codecov-io]

Current coverage is 76.90%

Merging #252 into master will not affect coverage as of 8311f13

@@            master   #252   diff @@
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  Files           11     11       
  Stmts         1260   1260       
  Branches         0      0       
  Methods          0      0       
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  Hit            969    969       
  Partial          0      0       
  Missed         291    291       

Review entire Coverage Diff as of 8311f13

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[onevcat]

@ivanbruel Thanks!