Fixed issue where signal strength was unknown in some cases, should fix #242
Fixed NullPointerException when getActionBar() returns null
Code commenting
Fixed some bugs detected during testing and changed some default values to more sane values
Completed code for SignalStrengthTracker, still gotta test it
Added SignalStrengthTracker to important places in the code so it is monitoring as it should
Renamed SignalStrengthMonitor to SignalStrengthTracker to keep it consistent with other classes
testing