Propsed ScriptTagHelper

- ScriptTagHelper added that changes src attribute to minified file name if it exists
- Changed the TagHelperSample.Web to support self-host (k web)
- Added Tag Helper projects to Mvc.NoFun.sln
- #1524
It's pretty ugly to say that to disable min-extension you had to pass in an empty attribute (or even uglier one with spaces). Can we come up with something cleaner?