Highlighting percolator

Hi all,

I just sent a pull request for a highlighting percolator. I've seen this
has been asked for before, so I thought I'd post to the list about it. All
the details are here:

I'd be happy for people interested in that functionality to try it out and
provide comments if any.


Itamar Syn-Hershko
Blog: http://code972.com
Twitter: @synhershko