Angle sign inconsistence

[TheNexus]

sf::Drawable currently rotates counter-clockwise for positive angles, the mathematical correct direction would be clockwise (since the Y axis points down). Rotating a sf::View and a sf::Drawable by the same angle has visible effects, although it shouldn't.

See also http://www.sfml-dev.org/forum/viewtopic.php?t=4467

[LaurentGomila]

That's right, this thing must be fixed for version 2.0.