Selectors grammar

The grammar is not quite right (unless the selector ignore rules are
changed (see *)). The old HASH token is reused, but it is not suitable
for the purpose for which it is employed P#100 under the spirit of CSS
should be ignored, but will not be, since it is a valid (CSS) NAME. The
hexcolor production should be defined as 
hexcolor
  : "#" HEXCOLOR
  ;

HEXCOLOR is simply {h}{3,6}

ID should be 

id:
 : "#" ID
 ;

with ID defined as

{idstart}{idchar}*

with 
idstart	[a-z]|{escape}
idchar	[a-z0-9-]|{escape}

These definitions are better in that, as well as removing the error,
they address the anomalous situation whereby P./* */class is valid, but
P#/* */id is not (P/* */#id is).

* http://lists.w3.org/Archives/Public/www-style/2000Jan/0194.html

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