Merge pull request #33 from damccull/master

Removed generated files from repo and updated gitignore. Updated buildtools version to 19.0.1
5.3.6
Build the available field list to allow only fields not currently in use to be shown. Add check to ensure that if a field is not on the visible display, it is removed from the definition so as to allow it to be selected in a different location.
Minor tweaks to the KML file writing logic to lessen its size. 
Correct an altitude change bug. 
Remove some dead code. 
Clean up some studio warnings.
Bug #022.
Ensure tracks file is properly closed on application exit.
Merge pull request #35 from damccull/SideBySideInstall

Side by side install
fixed radial/distance discrepency
Add -DEBUG suffix to the version name. Changes to build.gradle to support.