[add] support 'outlineColor' style prop

Fix #435

docs/components/View.md

@@ -213,6 +213,7 @@ Controls whether the View can be the target of touch events. The enhanced
 + `opacity`
 + `order`
 + `outline` ‡
++ `outlineColor` ‡
 + `overflow`
 + `overflowX` ‡
 + `overflowY` ‡

src/components/View/ViewStylePropTypes.js

@@ -31,6 +31,7 @@ module.exports = {
   boxShadow: string,
   cursor: string,
   outline: string,
+  outlineColor: ColorPropType,
   perspective: oneOfType([number, string]),
   perspectiveOrigin: string,
   transitionDelay: string,