fixes #1013
fix .gitignore for android studio files
Merge pull request #1014 from TShapinsky/issue_1013_null_drone

Fixes #1013 NullPointerException
Merge pull request #1016 from squilter/fix_.gitignore

fix .gitignore for android studio files
Merge branch 'master' of https://github.com/DroidPlanner/droidplanner into fix_savetolog_bug