WIP: Enhance textmate/sublime syntax highlighting

So far I got rid of special type declaration highlighting, which wasn't working. I'm not sure it's really necessary to have that, since the operator:: is highlighted, which is perhaps good enough (that is all the codemirror version of Julia highlighting does). 
I added support for functions defined without the 'function' keyword. 
I disabled special highlighting of bracketing symbols like parenthesis, as no other sublime mode that I know of (javascript, python, ...) does that. 
Maybe others have complains/suggestions I could implement before merging.