Added support for Android
Added support for Android

- set onShouldBlockNativeResponder to be true to ensure compatibility
with android. Default is false - when set to this an error is thrown
 - Moved the setting of content height and width to a method triggered
by on layout. Content width is undefined on Android in the
‘handlePanResponderGrant’ method
 - Refactored the render code to utilise methods so that duplication of
code is avoided

dancormier/react-native-swipeout,dancormier/react-native-swipeout,LeeChSien/react-native-swipeout,agmcleod/react-native-swipeout,dancormier/react-native-swipeout,LeeChSien/react-native-swipeout,agmcleod/react-native-swipeout