Remove caveat about slashes in branch names
Remove caveat about slashes in branch names

Bug in Heroku has been fixed - https://twitter.com/raulbleon/status/499351587094286336
alphagov/spotlight,alphagov/spotlight,alphagov/spotlight,tijmenb/spotlight,tijmenb/spotlight,tijmenb/spotlight,keithiopia/spotlight,keithiopia/spotlight,keithiopia/spotlight