Fixed: App crashed when sdcard not connected.
Added: Shared Preference default value.
Added: Remember we configured wifi once.
gotoActivity supports a previous activity.

We can tell which activity to go back to using
gotoActivity(previousActivity, nextActivity).
Added: Connect does not run on main thread.
Lock user into app.
Merge branch 'workflow'
Fixed: Action bar was showing.
Added: Connection through WEP.