Vid 718 badge

DON'T MERGE YET, still waiting on back end.

Adding the ui component Alert Badge per https://wikia-inc.atlassian.net/browse/VID-718.  

This is only the front end for the feature itself, so the logic still needs to be put in to hook up the back end. @saipetch, we will probably want to move the alert_badge config to the controller as well.  

Tagging some darwin guys for ui component @sebastian-wikia @RafLeszczynski