added imprint activity
updated layout xml. padding instead of margin to make it consisted across different sizes.
Merge branch 'origin/feature/Imprint'

Conflicts:
	AndroidManifest.xml
	res/values/strings.xml
	src/de/otaris/zertapps/privacychecker/appsList/AllAppsActivity.java
	src/de/otaris/zertapps/privacychecker/appsList/AppsByCategoryActivity.java
	src/de/otaris/zertapps/privacychecker/appsList/InstalledAppsActivity.java