Avoiding removing link/script tags inside templates

-Instead of removing link/script tags inside of template elements
we rewrite the href/src attribute to be valid once we use
static_builder
Aditionally such files (css/js pertaining to templates) are declared
as StaticFile types so they will not be rendered in the header of the
file. No thought has been given (yet) to how OptimizingStaticManager
will work with this