Added some UK specific places

Hello,

I've added some UK specific scenarios. Notably Cities, Counties and Post Codes. You could pull them into your master branch if you so wish. 

Unfortunately I could not get MBUnit to run at all, I tried everything, this could possibly be because I use VS 2013 but I'm not sure. As such I converted the unit tests to use NUnit instead. I would guess this may be the only bone of contention with you, but you could ignore that and pull the rest ? Or just accept it as is. All unit tests work as they did before and pass.

Dirk

PS: Apologies, this is my first pull request so I'm not really 100% on the protocol.
PPS: Oh I also added an AlphaNumeric generator for a specific length. So you can generate things like JSD83S23SD etc.