Contents of double and triple braces not highlighting as PHP

[tremby]

I tried to fix this myself but it caused other issues.

The test file is rendering for me like this:

There are various other issues here too:

• @yield isn't highlighted (it's not actually valid like that -- but it's still not highlighted if I change it to @yield('sectionname')
• @section isn't highlighted
• @endsection isn't highlighted (and @stop is an alias for that, which also isn't highlighted)
• @parent isn't highlighted

[johnhamelink]

I've been aware of this bug for quite a while - accepting pull requests :)