Remove unwanted animations
Remove unwanted animations

Summary:
Changelog: [internal]

# Problem
Assigning `CALayer.contents` implicitly animates the difference. As we keep `UIView` in recycle pool between usages, they keep their previous state. This was causing animation of border when the views were being reused.

# Solution
Wrapping application of mutations in `CATTransaction`.

Reviewed By: shergin

Differential Revision: D20442045

fbshipit-source-id: 214d6c422f23f399dec46b5bf1a38a7b64758160

exponent/react-native,hammerandchisel/react-native,janicduplessis/react-native,janicduplessis/react-native,facebook/react-native,myntra/react-native,janicduplessis/react-native,facebook/react-native,exponentjs/react-native,hoangpham95/react-native,hammerandchisel/react-native,myntra/react-native,exponent/react-native,hammerandchisel/react-native,javache/react-native,exponentjs/react-native,hammerandchisel/react-native,facebook/react-native,myntra/react-native,hoangpham95/react-native,facebook/react-native,javache/react-native,hammerandchisel/react-native,myntra/react-native,exponentjs/react-native,janicduplessis/react-native,pandiaraj44/react-native,pandiaraj44/react-native,hoangpham95/react-native,myntra/react-native,exponent/react-native,arthuralee/react-native,javache/react-native,hammerandchisel/react-native,myntra/react-native,janicduplessis/react-native,myntra/react-native,javache/react-native,arthuralee/react-native,facebook/react-native,javache/react-native,javache/react-native,exponent/react-native,exponent/react-native,hammerandchisel/react-native,hoangpham95/react-native,exponentjs/react-native,arthuralee/react-native,pandiaraj44/react-native,pandiaraj44/react-native,janicduplessis/react-native,exponent/react-native,pandiaraj44/react-native,exponent/react-native,javache/react-native,facebook/react-native,hammerandchisel/react-native,hoangpham95/react-native,arthuralee/react-native,myntra/react-native,javache/react-native,exponentjs/react-native,pandiaraj44/react-native,exponentjs/react-native,facebook/react-native,arthuralee/react-native,pandiaraj44/react-native,hoangpham95/react-native,facebook/react-native,facebook/react-native,hoangpham95/react-native,myntra/react-native,janicduplessis/react-native,javache/react-native,hoangpham95/react-native,janicduplessis/react-native,exponentjs/react-native,pandiaraj44/react-native,exponentjs/react-native,exponent/react-native