add setting to select map tile provider. this allows the user to choose between mapnik (default), cyclemap and mapquestosm. 

sadly, the other tile providers do not seem to work anymore (URL changed?).
Merge branch 'mapSelection' of https://github.com/jakobmoellers/osmtracker-android into jakobmoellers-mapSelection
[issue #105] Fix some whitespaces, choose tile provider using reflection
Fix tabs/spaces: Keep tabs only