Main UI ListActivity layout
Add list view layout and row layouts.

Each row has Device name and address views, as well as a toggle button
with lock/unlock icon for status feedback
Add DriveListActivity skeleton
Rename drawables
Partial implementation of DriveListAdapter
Require bt, mostly finish DriveListActivity

Fix bug in DriveNoDevicesFragment such that
its container is always a new device button no
matter the ID of that container
Merge pull request #13 from cellasecure/ui-dev-list

Main UI revamp