Fix 16 linter warnings in Examples/

Summary: Partially fixes #3316 by addressing 16 linter warnings:
 - Strings should be singlequote
 - Missing semicolon

Travis build jobs 1.1 through 1.4 complete successfully. 1.5 fails through what appears to be an unrelated issue on master.
Closes https://github.com/facebook/react-native/pull/3332

Reviewed By: @​svcscm

Differential Revision: D2531718

Pulled By: @javache

fb-gh-sync-id: ca22fbeac5fe3b4f725775a72f21b6dd7a75d94b

Examples/UIExplorer/Navigator/NavigationBarSample.js

@@ -23,7 +23,6 @@ var {
   Text,
   TouchableHighlight,
   TouchableOpacity,
-  View,
 } = React;
 
 var cssVar = require('cssVar');