[features] renaming "cafe" to "location"

We need to ask the user whether the place they have been is a cafe, bar or
restaurant, so we don't want to start by putting words in their mouths by
saying things are a cafe from the beginning.  "location" is thus a good
comprimise and is sufficiently general; however I think this could still be
named better...
Implemented entering a location's name
Linking build status image directly to the Travis project page