ZF-1788: Allow for extensible match-highlighting

Description

I'm finding the way Z_S_L handles match-highlighting to be quite limiting, the fixed list of colours clashes badly with the colour-scheme of my app, and I would like to be able to change them from my code, rather than by editing Zend's things.

Ideally, you would provide a way of extending the Html_Document class, so that I could replace the highlighting with one that adds CSS classnames rather than inline colours, but providing access to the colours array would be a step in the right direction.

Comments

Assigning to [~alexander] to initiate issue review.

This doesn't appear to have been fixed in 1.5.0. Please update if this is not correct.

Done.

PS See documentation for details.