Created some Core code and Android app code

This is just a start on implementing things in the Core.  I've created the necessary plumbing for the most part, and just a simple MockWebService that implements IWebService and is returned from the WebServiceFactory.Create() for now (Mocking is a bit of a pain on iOS for now, so this is probably an OK route to take for testing).

The shell of the Android app is mostly there, just needs the Volunteer screen mostly, and some fixes here and there, but many of the basic screens are there (albeit ugly).

This is probably a good point to have things at for our Detroit Mobile .NET Meetup.  We will continue on from here.

Note: The real Webservice implementation is completely lacking... Need to know a bit more about the actual webservice to complete this.  Also, might need to suggest some changes to the webservice to make the mobile app a bit easier to implement.