Merge pull request #4274 from neeklamy/patch-1

Pre-fill the ember.js tag in the SO link

CONTRIBUTING.md

@@ -3,10 +3,9 @@
 This is the issue tracker for Ember.js. The Ember.js community uses this site
 to collect and track bugs and discussions of new features. If you are having
 difficulties using Ember.js or have a question about usage please ask a
-question on StackOverflow: http://stackoverflow.com/questions/ask and tag
-your question with `ember.js`.
+question on Stack Overflow: http://stackoverflow.com/questions/ask?tags=ember.js
 
-The Ember.js community is very active on StackOverflow and most questions
+The Ember.js community is very active on Stack Overflow and most questions
 receive attention the same day they're posted:
 http://stackoverflow.com/questions/tagged/ember.js