added mouse_rolled event placeholder
mentionning mouse_rolled in comment regarding special actions list
added mouse_rolled event test
added mouse_rolled to register listeners
added event type mousewheel
reflexion required...
Merge remote branch 'lutangar/wheel_events' into mouse_wheel
normalize scroll events across chrome, firefox; demonstrate crolling
use loadProjectionMatrix instead of a direct copy, which is unsafe
update changelog
fix chrome
one less reference to @depth
an extra sanity check