Nuget packaging

Please edit the .nuspec to your liking
You will need to create a nuget account to publish - see
http://docs.nuget.org/docs/creating-packages/creating-and-publishing-a-package
- most of these steps I've taken care for you, you just need to get an
API key and add it to your nuget.exe

Running update.ps1 will update the nuget.exe by itself
Build.ps1 will build the package
Publish.ps1 will... well, publish it :)