Added dependencies support for directives.

https://github.com/kyoken74/gwt-angular/issues/62
Reverted the Partial and the generator.

I was not quite happy with the way it was implemented. I revmoed it for
now. Get back to the resources module, figure out how that works, and
then come back to this later.
Prettify directive is broken again...
Reduced the scope of prettify.
Supporting class literal for Filter and Directive registration.

Also cleaned up Creator type name, which was earlier CreatorFactory,
though it was not a factory of creators, but in fact, creators.