Android: Update to API 21
fixed issue 1179
Merge pull request #1189 from DroidPlanner/maintenance

Android: Update to API 21
Merge pull request #1190 from ne0fhyk/fix_issue_1179

Fix issue 1179
merged android lib project back into the android project.
updated list of files to ignore.
update cleanup
Merge pull request #1191 from ne0fhyk/merge_android_lib

Merge android lib
fixed issue 1182
Merge pull request #1192 from ne0fhyk/fix_issue_1182

Fix issue 1182
Added copter specific flight actions.
added generic action bar.
added stub implementation for plane specific flight actions.
Merge branch 'master' of https://github.com/DroidPlanner/droidplanner into fix_issue_1081
completed plane flight actions implementation.
fixed issue with triggering guided mode on arduplane.
fixed issue with sliding up panel not triggering when the drone is a plane.
Merge pull request #1193 from ne0fhyk/fix_issue_1081

Fix issue #1081
adding logging to track the issue with the follow me speed check bug.
fixed issue #1080
code cleanup.
Merge pull request #1194 from ne0fhyk/fix_issue_1080

Fix issue 1080
Merge branch 'master' of https://github.com/DroidPlanner/droidplanner into fix_issue_1176