adjusted parts related to lwf-loader.js.

* Updated lwf-loader to fix alignment bugs
* Updated loader viewing option for mobile devices usage
* Updated lwf-loader viewing option related files
* removed lwf-loader.js from index-*.html except index-loader.html.
* fixed to prioritize user-provided lwf-loader*.js/underscore*.js not only for index-loader.html but also other index-*.html.