Updated submodules
Basic Gradle and .iml files. Adjusted .gitignore
Fixed missing value, fixed duplicate entries
Adjusted SDK version in AndroidManifest, fixed a duplicate entry
"Redirecting" all Android Support library dependencies to sub project
Updated README
Merge pull request #619 from zumbrunnen/gradle

Gradle support
Merge branch 'master' of https://github.com/DroidPlanner/droidplanner into feature_phone_ui

Conflicts:
	DroidPlanner/res/values/styles.xml
	usb-serial-for-android