-Corrected back button behavior on some phones;
-Corrected orphaned GPS listener bug;
-Correct layout issues with smaller screens (added scrollbar to the
instructions textview);
-Refactored code into 'util' classes: FileUtils and AndroidUtils;
-Created toast messages for entry activity options menu items;
-Removed the 'onDestroy' and 'onStop' methods, since it had no purpose;
-Changed the application version in the Manifest;