Implements a basic usage of Google Analytics

This fixes #82, but is just the first step
It took a couple of days for GA to start reporting, so
I'm not completely confident that we're getting enough info
yet, and there may have to be more app tracking added.
Fix up preferences handling so the screen shows current setting in summary
Seems that the 'auto' activity tracking isn't quite there

This adds the start/stop that are required on pre-api14
And also programmatically sets 'auto'
Merge branch '20141124_add_google_analytics' of github.com:rfay/wsandroid into rfay-20141124_add_google_analytics

Conflicts:
	AndroidManifest.xml
	res/values/strings.xml
Merge branch 'rfay-20141124_add_google_analytics'