Replace JSMin with sometime simpler

[bdukes]

The JSMin post-build step is a bit kludgey. At the moment, it's not clear which files to edit to actually get changes to the deployed JavaScript (compiling the JS as an embedded resource doesn't help this either). Perhaps a README in the JavaScript folder would be a helpful start.

I'd prefer removing minification and bundling altogether in favor of the Client Resource Management Framework, but that will limit our reach to DNN 6.1 and above.

We could also integrate a YUI Compressor MSBuild step...