Added very basic NuGet package

Dear Jesse,

I added very basic NuGet package.
The package has been pushed to: https://www.nuget.org/packages/jquery-iframe-auto-height/

I you wish I will add/transfer ownership of the package to you.

In the fork you will see the specifications file for the latest release.

Maybe next will I could make a Bundle configuration for Asp.Net MVC.

Have fun,

Robert