Add support for Groovy Template editor

[eli-jordan]

Its quite frustrating that when I'm writing groovy code I have a great editor, but when I am in a template file writing a scriptlet (i.e. <% print('foo') %>) I don't have any of the same awesomeness. It we be great if the same things that work in a .groovy file also work between scriptlet tags in a template

[eric-milles]

Is this the same thing as the Grails GSP editor?