Typo fixed: "activitys" -> "activities"
Typo fixed: "listner" -> "listener"
Merge branch 'master' into typos

Conflicts:
	DroidPlanner/src/org/droidplanner/fragments/RcSetupFragment.java
	DroidPlanner/src/org/droidplanner/fragments/calibration/ch/FragmentSetupCH.java
	DroidPlanner/src/org/droidplanner/fragments/calibration/flightmodes/FragmentSetupFM.java
	DroidPlanner/src/org/droidplanner/fragments/calibration/rc/FragmentSetupRC.java
	DroidPlanner/src/org/droidplanner/fragments/calibration/sf/FragmentSetupSF.java
Merge branch 'master' into typos
Merge pull request #605 from arthurbenemann/typos

Typos "activitys" and "listner" fixed