Created a Monodroid version of AutoMapper

This version is based on the Silverlight version. Added an #if MONODROID directive in case they diverge in time. Ran a test on Android and it works (but Monodroid does not have NUnit yet so did not port test suite).

I don't see any reason why this won't work for iOS using Monotouch but I don't have a Mac to test on yet. Will attempt an iOS/Monotouch port.
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