Sokovikov 67efe4c1a9 custom back button handler
Summary:sometimes it is nessesary to handle back button
specifically for component, by changing its state.
 For ex. exit from edit mode.
Closes https://github.com/facebook/react-native/pull/5062

Differential Revision: D3084590

Pulled By: ericvicenti

fb-gh-sync-id: 13a4ea1d64ce725daa5d3af0d629a0c132a3f3d5
shipit-source-id: 13a4ea1d64ce725daa5d3af0d629a0c132a3f3d5
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