Adapted UploadManager for sending phenomena MAF/CO2/Consumption/Speed.
Implemented backup of tracks. Tracks are saved in JSON format to SD card
when upload button is pushed. TODO: ALL (!) tracks that are currently
stored in local DB are written to a single file (root/Tracks.txt).
Method dbAdapter.removeTrackFromLocalDb(Track) needed to remove
successfully uploaded tracks from local database! TODO: Enable upload
button in menu only when tracks exist in local DB.
Merge branch 'master' of https://github.com/LinkedCitizenScience2013/lcs-app.git