re-implemented theme watch tasks, add parallel tasks, added ability to c...

...reate dynamic parallel targets
I'm actually not sure. I tried to do some research on this to get you an authoritative answer, but I'm not getting anything definite. I think it's possible that you may have to tunnel the necessary livereload port, so given that complexity, this also might be something to remove from GDT and let users handle in their own custom tasks. Totally your call.