[racket] How to associate a custom syntax color lexer with a new module language

Hi All,

I have implemented a #lang language called bracket.
The language is installed as a collection with the raco link command.

soegaard$ /Applications/Racket\ Full\ v5.3.0.11/bin/raco link -l
User links:
 collection: "bracket"  path: "/Users/soegaard/Dropbox/GitHub/bracket/bracket"
Installation links:
soegaard$

To get proper source coloring in DrRacket, I have implemented a color-lexer.