Highlighting gets confused by colons in class parameters

[benh57]

Example: file { '/etc/salt/minion.d/calamari.conf': ensure => 'present', content => "master: ${master}", }

The colon in the 'content' string breaks the highlighter.

[eklein]

If you can figure out what's causing this, I'd happily accept a pull request. I don't use sublime or puppet anymore, so this is going to be a tough for me to solve :)