Sharing data

Main Feature:
* User and Wallet objects on the C# side now get automagically updated when the Obj C changes them.

Also:
* Needed to refactor basically all the wiring for wallets/users
  * Removed callbacks as static variables and put them as params into the C# side
  * Generalized most of said callbacks in the ArbiterBinding side... pretty much any call that doesn't immediately parse the response
* Generalized a lot of the objc-C# interop layers to remove a lot of boilerplate code
* Moved parsing logic into protocol classes instead of the Binding class
* Removed as much orphaned data on the C# side as I could

Known Issues:
* You can logout, but after that there are crashes when you try to play another game or something. I'm guessing this is new behavior, but not actually sure
  * Also, that probably shouldn't be a blocker for HH, so I'd like to get this into HH and then fix the logout issues separately
All the ClientCallbackFOOUpdated() functions are giving me warnings. I tried importing ArbiterCWrapper into Arbiter.m, but that caused everything to actually crash. I've created an issue on master for this.

![screen shot 2014-09-07 at 5 12 11 pm](https://cloud.githubusercontent.com/assets/278775/4180190/29b270ea-36ed-11e4-8cc2-562d6cf44c66.png)