first attempt to get category from play store with android-market-api
fixed display of unavailable functional rating, removed android market api access
Merge branch 'origin/feature/UncoveredApps'

Conflicts:
	res/layout/app_detail_header.xml
	res/values/strings.xml
	src/de/otaris/zertapps/privacychecker/AppController.java
	src/de/otaris/zertapps/privacychecker/appDetails/header/ExtendedHeader.java
	src/de/otaris/zertapps/privacychecker/appsList/AppListItemAdapter.java
fixed sorting order for most recent apps
fixed fixing of locks of total rating after scrolling