Add links to share extension on FB, Twitter & G+

Author: barbushin

options.html

@@ -87,7 +87,12 @@ <h2>Global options</h2>
 	</label>
 
 	<div style="margin-top: 10px;">
-		* Contribute to source code or request new feature on <a href="https://github.com/barbushin/javascript-errors-notifier" target="_blank">GitHub</a>
+		* Contribute to source code or request new feature on <a href="https://github.com/barbushin/javascript-errors-notifier" target="_blank">GitHub</a><br/>
+		* Share this extension with your friends on
+			<a href="https://www.facebook.com/sharer/sharer.php?u=https%3A//goo.gl/sU4lPG" target="_blank">Facebook</a>,
+			<a href="https://twitter.com/home?status=Be%20sure%20about%20website%20stability%20with%20Google%20Chrome%20extension%20-%20JavaScript%20Errors%20Notifier%20https%3A//goo.gl/sU4lPG">Twitter</a> or
+			<a href="https://plus.google.com/share?url=https%3A//goo.gl/sU4lPG" target="_blank">G+</a>
+		<br/>
 
 		<div id="recommendation">
 			* Rate this extension on Google Chrome WebStore: <strong> <a href="http://goo.gl/rIjsXk" target="_blank" id="openRecommendation">Yes</a> / <a href="#" id="hideRecommendation">No</a></strong>