Nuget packaging infrastructure

Hi,

I'm planning on using the CTCT Wrapper project in a system that uses the nuget package manager (http://nuget.org/)  I've added a nuget directory and packaging script.  The nuget CTCTWrapper.nuspec file needs to be filled out properly (version, authors and an license, couldn't find that info) but once that's done you can package it up and publish it to the core nuget repositories if you are interested.

Thought you might be interested in doing it, so I made a pull request out of it.

Cheers,
Carson