Merge branch 'notify_more_agressively' into 'master'

...project/briar/android/AndroidNotificationManagerImpl.java

...g/briarproject/briar/android/blog/FeedControllerImpl.java

...iarproject/briar/android/contact/ContactListFragment.java

...g/briarproject/briar/android/forum/ForumListFragment.java

...ar/android/privategroup/list/GroupListControllerImpl.java

...briarproject/briar/android/settings/SettingsFragment.java

...project/briar/api/android/AndroidNotificationManager.java

briar-android/src/main/res/values/strings.xml

briar-android/src/main/res/xml/settings.xml