Add Google Analytics reporting
Make use of test election a configurable setting in api_keys.xml
Reduce font size slightly for some devices.

This is to prevent clipping large wrapped text fields on high-res, small screens.
Add attribution for Google Maps
Add license.

Closes #57.
Load open source license asynchronously.

Otherwise the About view takes several seconds to load.
Merge pull request #58 from flibbertigibbet/feature/add-analytics

Feature/add analytics