Android: Update master version to match the beta
Travis: Update build tools and API on travis build
Libraries: Move classpath to the way Eclipse want's it to be.
Android: Clean-up libraries manifest
fixing travis ci issues.
Merge pull request #1185 from DroidPlanner/maintenance

Maintenance
fixed issue 1120
Merge pull request #1188 from ne0fhyk/fix_issue_1120

Fixed issue 1120
Android: Update to API 21
Merge pull request #1189 from DroidPlanner/maintenance

Android: Update to API 21
Core: add code to handle magnetometer messages
Android: Widget to plot magnetometer data
Android: Plot magnetometer data in calibration screen
Android: Improve scatter plot graphics
Library: Add EllipsoidFit library from https://github.com/KEOpenSource/EllipsoidFit
Desktop: Partialy implement the handler code on the desktop logic
Magnetometer: Use the EllipsoidFit library to create calibration parameters for the magnetometer
Core: Extracting magnetometer calibration code to a new classs
Magnetometer: Move magnetometer class to inside the CORE project
Android: Execute the magnetometer calibration on the App