updated gradle build files to support the new version of gradle (1.10+), android build tools (0.9.+) and android-studio (0.5.1+)
updated generic method definition.
added null check.
- fixed typos
- added class documentation to MissionItemView
- removed unused methods, and fields.
Comment out follow me option until it is implemented.
Merge pull request #704 from tensafefrogs/master

Comment out follow me option until it is implemented.
Clear the previous flight path when arming. Fixes #701.
Merge pull request #705 from tensafefrogs/flight-path-clear-on-arm

Clear the previous flight path when arming. Fixes #701.
Merge pull request #702 from ne0fhyk/fix_misc

Miscellaneous set of fixes