Add support for imenu

[Damien Cassou]

Jani Nikula <jani at nikula.org> writes:
> I would appreciate a commit message explaining what the patch is 
> about, written to someone who doesn't know what imenu is, or how 
> it could be applicable in search and show modes. 

done

> Please also look into using git send-email if possible, instead 
> of attaching the patch. 

done. 

-- 
Damien Cassou
http://damiencassou.seasidehosting.st

"Success is the ability to go from one failure to another without
losing enthusiasm." --Winston Churchill