Merge pull request #9 from senseobservationsystems/motion_prefs

Added preferences for the motion sensor
Added preferences for temperature, pressure, humidity sensors
Removed android support library (should be inherited from
sense-android-library project)
Merge branch 'release-2.7.0' into develop
Merge branch 'release-2.7.0' into develop
Merge branch 'develop' of https://github.com/senseobservationsystems/sense-android-app into develop
Removed DataTransmitter receiver from AndroidManifest (replaced by new
scheduling system)
Bumped version code to 2.8.0
Merge branch 'develop'
hotfix: revert to android 17 as target to solve proguard issues