5.1.0

react-native-web support:

• removed the stylesheet from styles.js - now we just export an object
• we now apply a default for all platform.selects
• flatten styles for custom display styles on text display items

optimisations (+react-native-web things):

• removed repeated calls to removeTextStyleProps in render rules
• created a stylesheet after merging of style prop for views only

Other

• fixed bug where passing mergeStyle with no style prop crashed out