Updated the nuspec file to create a useful NuGet package.

We love the Glimpse.Soap plugin for seeing SOAP requests in context of the page that generates them.  One thing that would be even better is if Glimpse.Soap was available on NuGet.  So I've updated the .nuspec file to create a useful NuGet package.  This required also updating the AssemblyInfo.cs file

I also removed the extra Readme file to prevent confusion and case-sensitivity issues on Windows.

To generate the .nupkg file, just run "nuget pack" inside the Glimpse.Soap project directory.  The package also adds the configuration key to web.config.