Added sharing functionality. Fixes #2
Changed withdraw button to link. Fixes #18
Better wording: use 'votes' instead of 'favourites'
Add bugsnag gem, configure it and update the docs.
Merge branch 'exceptions_notifications' into euruko2013
Update doc regarding how to deploy to heroku
Merge remote-tracking branch 'origin/issue_18' into euruko2013. Fixes #18.
Merge remote-tracking branch 'origin/sharing' into euruko2013. Fixes #2.