Provide support to serve html from asset-manager

This will enable html templates to be served from asset-manager, for example, to support Angular templates and other client-side templating needs.

HTML files that are placed in the assets/html directory, or the html directory of any assembled directory, will be served from /html/<filename>.html

Also added a flag to skip name mangling during javascript compression. It is not currently use pending further discussion as to the best way to set the flag, but the functionality is now available.