Switched AppBus for ResultHandler, Controller for Helper. Added the basics for LifecycleControllers and implemented it for BriarActivity and NavDrawerActivity

Removes all programatic calls that modify the layout and uses the XML
resource instead.

Fixes #270.

Modified the project structure, removed module extension and went instead for a non-complete core dependency graph

also run setting the default preferences in a background thread

Closes #184

This closes #204

This should make it easier for people to build the project with a freshly
downloaded ADT Bundle.

We don't need two separate executors for long-running IO threads.

Tor has a controller command, TAKEOWNERSHIP, and a configuration option,
__OwningControllerProcess, that work together to ensure Tor shuts down
when the controlling process dies and/or disconnects from the control
port. By using them we can avoid creating runaway Tor processes that
have to be killed with hacks.