Controllers should depend on ResultHandler not its impl.

...roid/src/org/briarproject/android/blogs/BlogActivity.java

...id/src/org/briarproject/android/blogs/FeedController.java

...rc/org/briarproject/android/blogs/FeedControllerImpl.java

...roid/src/org/briarproject/android/blogs/FeedFragment.java

.../briarproject/android/controller/NavDrawerController.java

...arproject/android/controller/NavDrawerControllerImpl.java

...oid/src/org/briarproject/android/forum/ForumActivity.java