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
`Path.ChangeExtension()` is [documented](http://msdn.microsoft.com/en-us/library/system.io.path.changeextension(v=vs.110).aspx) to accept a "new extension (with or without a leading period)".