Turn MapActivity into a SherlockActivity

I picked the most difficult one to convert first. Now the map activity
has an action bar. on older devices.
Add ActionBarSherlock Functionality to all Activities.

For each Activity
Extend SherlockActivity or derivative
remove imports for Menu and MenuItem replaced with sherlock
alternatives.
Change getMenuInflater() to getSupportMenuInflater()
Merge branch 'px-amaac' of https://github.com/px-amaac/vegdroid into px-amaac
Disable private GMap API keys
Add ActionBarSherlock to README.BUILD
Include ActionBarSherlock license into AboutActivity
Cosmetics
Merge branch 'sherlock'