Sokovikov 849a0f31ac Allow to set refresh control title color
Summary:Closes #6812

![simulator screen shot 14 apr 2016 12 13 36](https://cloud.githubusercontent.com/assets/1488195/14521441/0abccf5c-0232-11e6-94dc-0ebdbfac4b3f.png)
Closes https://github.com/facebook/react-native/pull/6970

Differential Revision: D3189244

fb-gh-sync-id: 7625b6ab5859aaa20bc0cb379855c5daeb584abf
fbshipit-source-id: 7625b6ab5859aaa20bc0cb379855c5daeb584abf
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