<Text> module add textDecoration style attributes

Summary:
This is simply a rebased and squashed version of @KJlmfe's PR over at https://github.com/facebook/react-native/pull/845

It was actually already squashed into one commit, but for some reason that was hard to see from the original PR.
Closes https://github.com/facebook/react-native/pull/1869
Github Author: KJlmfe <kjlmfe@gmail.com>

Libraries/Text/TextStylePropTypes.js

@@ -33,6 +33,13 @@ var TextStylePropTypes = Object.assign(Object.create(ViewStylePropTypes), {
     ['auto' /*default*/, 'ltr', 'rtl']
   ),
   letterSpacing: ReactPropTypes.number,
+  textDecorationLine:ReactPropTypes.oneOf(
+    ['none' /*default*/, 'underline', 'line-through', 'underline line-through']
+  ),
+  textDecorationStyle:ReactPropTypes.oneOf(
+    ['solid' /*default*/, 'double', 'dotted','dashed']
+  ),
+  textDecorationColor: ReactPropTypes.string,
 });
 
 // Text doesn't support padding correctly (#4841912)