v3.0.1: OpenTracks

Changes:
- Share markers
- Restructured settings
- Removed actionbar back button
- Export: removed photo size settings option
- Export: KML as format is now selectable

Bugfixes:
- export directory is now /OpenTracks/
- landscape mode is not crashing
- fixed KML/KMZ export

Developer:
- Test are executable (but many failing)
- Enabled continuous integration with TravisCI (no tests)