Bundle: Allows TypeScript in JS bundles. (#1347)

For details, please visit #1347

Now lets hope I don't break everyone's life :smiley: 


@am11, as long as the ```require([``` replace code stay in place and EditorExtensions/Settings/WESettings.cs > ```public string RootDirectory { get; set; }``` stays in place, I will have what I need.

The reason to include .js and .js (through .ts ref) side by side in a javascript bundle was to make it clearer where the source code was coming from. I do agree that the scenario I added was very specific and should be removed.

I will also be looking into that new extension MS released for running nodejs modules on specific actions ([Task runner explorer](http://visualstudiogallery.msdn.microsoft.com/8e1b4368-4afb-467a-bc13-9650572db708)) which could remove the need for WE for less and javascript bundling.