render/js.go
func JavaScript(names ...string) Renderer {
	e := New(Options{})
	return e.JavaScript(names...)
}
func JavaScript(names ...string) Renderer {
	e := New(Options{})
	return e.JavaScript(names...)
}
// JavaScript renders the named files using the 'application/javascript'
// content type and the github.com/gobuffalo/plush
// package for templating. If more than 1 file is provided
// the second file will be considered a "layout" file
// and the first file will be the "content" file which will
// be placed into the "layout" using "<%= yield %>".