added missing gpl header to xml-resources
app should be installed on sdcard to save main-memory
Updated to AndroidStudio1.0; gradle-2.2.1
#15 fixed: import of ics files with more than 1 event will be processed one by one instead of in parallel which may cause stackoverflow/program-freeze
Merge remote-tracking branch 'remotes/origin/development' into release-fdroid

resolved Conflicts:
	app/build.gradle
	app/src/main/AndroidManifest.xml
Update App Documentation
V1.5.7.14-141215