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/SwitchIOSExample.js

@@ -107,7 +107,7 @@ var EventSwitchExample = React.createClass({
             onValueChange={(value) => this.setState({eventSwitchIsOn: value})}
             style={{marginBottom: 10}}
             value={this.state.eventSwitchIsOn} />
-            <Text>{this.state.eventSwitchIsOn ? "On" : "Off"}</Text>
+            <Text>{this.state.eventSwitchIsOn ? 'On' : 'Off'}</Text>
         </View>
         <View>
           <SwitchIOS
@@ -118,7 +118,7 @@ var EventSwitchExample = React.createClass({
             onValueChange={(value) => this.setState({eventSwitchRegressionIsOn: value})}
             style={{marginBottom: 10}}
             value={this.state.eventSwitchRegressionIsOn} />
-          <Text>{this.state.eventSwitchRegressionIsOn ? "On" : "Off"}</Text>
+          <Text>{this.state.eventSwitchRegressionIsOn ? 'On' : 'Off'}</Text>
         </View>
       </View>
     );