[TxMt] css language definition update

[Matthew Johnson]

> You would simply include the CSS language to your bundle via an  
> "include" command, so keeping things up-to-date should be automatic  
> in this case.

Ideally this would work, but unfortunately with the change I need to  
make to the language grammar it won't.  I found a post on the list  
where Alan says he wants to make it possible to inject an include  
into the grammar from outside of it by using a scope selector, but  
that this will be a post 2.0 feature.  So for now, doing what I want  
requires editing or copying the grammar itself.

Matthew