Add support for the Julia language

[ararslan]

It would be awesome to have Julia included among the default languages here. (I don't know MoonScript, otherwise I'd try my hand at a PR for this.)

[refi64]

FWIW you don't really have to be good at MoonScript...

I think I have an old half-completed Julia bundle based on the Vim one from before I ditched the language. Let me see if I can dig it up...

[shalabhc]

+1 Julia would be a nice addition.

[joachimneu]

+1