refactoring of the GCS heartbeat logic.
Heartbeat: Inline the thread, and cleaning Javadoc so the code is easier to see.
HeartBeat: Fixing variable name.

A period should be called "perido", and not "freq".
Merge branch 'master' into heartbeatFix

Conflicts:
	DroidPlanner/src/com/droidplanner/activitys/helpers/SuperUI.java
Merge pull request #447 from arthurbenemann/heartbeatFix

Refactoring of the GCS heartbeat logic.