yacker SPARQL updated to parse comments

I updated the yacker grammar to accept comments.
See <http://w3.org/brief/MjA=> for a validation of

[[
# starting comment
#no-spacecomment
SELECT # mid comment
       *
 WHERE { ?s ?p [ # bnode comment
                 ] }
# end comment
]]


Changes:
+ [83a]  	COMMENT   ::=           '#' [^\r\n]*
+ [83b]  	IGNORED   ::=           WS+ | COMMENT
- [84]   	ANON 	  ::=   	'[' WS* ']'
+ [84]   	ANON 	  ::=   	'[' IGNORED* ']'
+ @pass: 	IGNORED
-- 
-eric

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