Doxygen documentation support

To run:
Enter Core directory
run 'doxygen' on a terminal
added `AndroidLib` project skeleton.
moved common resources to the `AndroidLib` project.
Added eclipse project files for the `AndroidLib` project.
Merge branch 'master' of https://github.com/DroidPlanner/droidplanner into feature_android_lib
Merge branch 'master' of https://github.com/DroidPlanner/droidplanner into feature_android_lib
improved Google map implementation.
updated the `NotificationProvider` interface.
Merge branch 'master' of https://github.com/DroidPlanner/droidplanner into feature_android_lib
updated `NotificationHandler` to take advantage of the updated `NotificationProvider` interface.
Merge branch 'master' of https://github.com/DroidPlanner/droidplanner into feature_android_lib
`NotificationHandler` javadoc update.
Merge branch 'master' of https://github.com/DroidPlanner/droidplanner into feature_android_lib

Conflicts:
	Android/src/org/droidplanner/android/maps/providers/google_map/GoogleMapFragment.java
removed transparent navigation bar on phone.
added 'slide up panel' gradle library dependency.
Merge branch 'master' of https://github.com/DroidPlanner/droidplanner into feature_android_lib
removed FIXME comment that was already fixed
Only read periodic tts status is armed
merge with latest from upstream/master.
moved the flight mode panel information to a sliding up panel layout.
fixed issue with collapsing the sliding up panel.