Google Play Services library update.
Using new setIcon method to change the drone marker icon.
GUI: Starting to extract all dronemarker methods to a new class
GUI: fixing some problems with the DroneMarker class.
GUI: Removing some code duplication on the DroneMarker Class
Merge branch 'master' into newMaps
Fixing some errors in the french translation.
Google Play Services library update.
Merge branch 'master' of https://github.com/realbuxtehuder/droidplanner.git

Conflicts:
	google-play-services_lib/.classpath
	google-play-services_lib/project.properties
Updating the README
The drone marker must be visible!
Merge branch 'master' into newMaps