fix fb comment count
move logic to controller
Merge pull request #1035 from diogob/add_referral_link_to_mixpanel

update mixpanel properties adding referral to contribution events.
Merge pull request #1033 from adrianob/fix_fb_comment_count

fix fb comment count
solved conflicts
adds headers from future to production
adds global alert about beta for testing purposes
show beta banner only if we don't have a user with projects logged in