Fixer bug in Twitter.java (mis-inclusion) in usesLibraries causing Twitter component not working correctly.
1. Fix bug for updateCircle.
2. Remove the default marker
Fix bug in GoogleMap component (return null when calling getMyLocation).
Add LocationListener interface, as well as the necessary methods needed
(onConnected, onChanged)
fix bug that does not do mLocationClient.connect when
EnableMyLocation(true)
Fix bug on OnLocationChanged()
Merge branch 'bug-fix/map-view-layout' into dig-develop

resolved Conflicts:
	appinventor/components/src/com/google/appinventor/components/runtime/GoogleMap.java