Include a .nuspec package file to include handlebars.js on NuGet

I thought it might be useful to include handlebars.js on NuGet so I created a nuspec file for the project.

Not sure if it's named or placed in a fashion that would be acceptable for all those involved with the project.

I'd also be happy to push the package to NuGet if need be. Otherwise: http://docs.nuget.org/docs/creating-packages/creating-and-publishing-a-package describes what it would take.