Fix line comments (//).

Now they work when they come after code in a line.

This fixes #19
Merge pull request #20 from cespare/comment-syntax-fix

Fix line comments (//).
fixed; stylus comment after property
fixed; highlighting variables without $
Closes #22
fixed; braces indenting
added; css3 syntax as part of project
various fixes
single line comment ignore http://
Merge pull request #24 from popomore/master

background:url has wrong highlight
Merge branch 'wavded/vim-stylus/master'