Merge branch 'pr/400' into improve_notifications_pr_400_with_develop
Grant that notifications of finished downloads can be removed from notification are without clicking on
Progress bar in notifications is hidden when download/upload finishes
Updated Android support library, mainly to fix crash in Android 3.x devices due to new API for notifications
Grant that progress bar in notifications is shown in Android 2.x and 3.x devices
Fixed contrast of text in notifications for Android 2.x and 3.x
Added notification icons with dark background to fix contrast in Android 2.x and 3.x
Merge branch 'develop' into improve_notifications_pr_400_with_develop
Merge pull request #444 from owncloud/improve_notifications_pr_400_with_develop

Fix several problems about notifications in Android 2.x and 3.x after upgrade to newest Android notifications API