Add AngularJS from NuGet.

Add NuGet packages for AngularJS, the AngularJS typings from
DefinitelyTyped, and the AngularJS seed project.

In order to get the project to compile with the AngularJS seed project,
I had to delete our nascent HomeController, as the SeedProject.dll file
included in that project's NuGet package exports its own HomeController
for use with the sample views.

As we start to build the project out, we will be able to remove the
reference to the SeedProject DLL, and possibly even the NuGet package.