Further refactoring to integrate Bing Maps REST.
- Compiles but tests need work.
- Separate out UserAgent generation to a base class.
- Restructure MapsClient to match the SpatialDataClient patterns.
- Move many of the ResponseExtensions into the MapsResponse directly.
- Pull much of the documentation from MSDN into the code.
- Restructure the Bing-provided objects to use Lists wherever possible.
- Tests working for all available functionality. Some functionality from the original merge has been removed, it will be re-added later.