add api_key and do refactoring api persistent header
add api v4 support
add lib
run on 4+ and 2.3 android, but in 2.3 prefference don't work and actionbar looking badly
now preference work, but via deprecated methods
fix location source, return back to button in action bar
fix some, release candidate
Merge branch 'migrate_to_old_api' into migrate_to_sherlock
Merge branch 'migrate_to_sherlock'
add readme and changelog