project libraries update.
Merge pull request #802 from ne0fhyk/feature_libraries_update

Project libraries update
integration of google analytics within droidplanner.
fixed issues preventing google analytics from dispatching recorded hits.
cleaned up the styles resource file.
added preference to disable usage statistics reporting.
added 'up' navigation button to the settings screen.
Added 'mode details panel' usage tracking.
created package for analytics related code/logic.
added a Category enum to store all analytics related categories.
Starting to work on the follow-me UI
Android: Fixed wrong id on buttons.
Follow: By default use Leash for follow me, with 2Hz update rate
Merge pull request #808 from arthurbenemann/FollowImprovements

Follow detail fragment
adding support for continuous integration via travis ci.
updated gradle build files to allow for a successful build process.
adding travis ci build status to the README file.
testing travis ci deployement of the built apk files.
updated travis ci script.
updated travis ci script.
attempt to fix travis ci build issues.
attempt to fix travis ci build issues.
specifying the apk files to upload to github releases.