Peter/various fixes

- Adds OSM Attribution
- On back in routing mode acts as a resume button click if the resume button is visible
- Routing arrow is now mapzen red
It's a clarity thing - I'm use the variable to indicate what onBackAction returns. The method name  onBackAction makes sense in the context of the routefragment class but the what the return value represents isn't that clear. If you think it's obvious enough though I'll just put it in the parentheses.