Multiline comments syntax highlight.

[yglukhov]

Basically subj. Currently multiline comments and doc commnets are not highlighted properly:

#[
This is a comment.
#[
This comment is nested
]#
]#

##[
Doc comment

##[
Nested doc commnet
]##

]##

Unfortunaly github doesnt support it as well =)

[oderwat]

I think I fixed that (your example works) with #17 (I also converted the format of the syntax file to make it more readable for me)

[kosz78]

Available in 0.5.4 release