MySpeed 2.1.1

A quick bug fix to the OpenStreetMap view for MySpeed: if you return to MySpeed after going to another activity, the location wouldn't be updated. A rather stupid bug in osmdroid.

I also did a bit of an attempt at avoiding memory leaks.

And one other minor fix: I accidentally left a debug feature in the previous release - there was a dot in the middle of the speed cameras (only on the Google Map view - I never figured out why it wasn't displaying on the OSM view).