Making the rating painter class public

[Sebastian Trüg]

The Nepomuk::RatingPainter class is used in the Nepomuk lib to draw ratings, 
in Dolphin to draw rating categorizations, and in nepomuk playground to draw 
ratings for search results. Thus, having 3 places where it is used, I propose 
to make it public API for 4.1.

Please see the attached files for the class. Any objections?

Cheers,
Sebastian
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