Fix in pixi.js - detect newer versions of IE and disable WebGL in them.
Only change cursor to crosshair if it should be the default cursor (in the gameplay's interaction manager).
Rewritten the transition between menu screens to prevent problems with the intervals not cleared when they should have.
The pauseMask could be null when called by IE's weird onblur/onfocus event model.
Implemented sound muting.
Now the muted state of music/sound is saved in cookies.
Implemented the loading screen.
Added temporary sound muting icons.
Updated the rules text.
Changed page title.