Do not reload first page everytime onStart is called

Intent actions should always be on onCreate. This also modifies
the bus behavior to have it init on onCreate, then on onStop but
only if it is null - which is set if onStop has run. This ensures
that we do not double register.

Change-Id: I2e5c1385ff01a1514ec4772203f297f43295c727
Merge "Do not reload first page everytime onStart is called"