Fixing key press detection for Opera
Ensuring local vars are local; adding more properties to our new event
Merge pull request #401 from darrentorpey/master

Fixing key press detection for Opera
Sprite scaling for DOM with backgroundSize=cover

Currently it's not possible to scale sprites - they get clipped. Default behaviour should be to scale.
https://groups.google.com/forum/?fromgroups=#!topic/craftyjs/BFo8K3FgySc
Merge pull request #423 from cawoodm/patch-2

Sprite scaling for DOM with backgroundSize=cover
Added improved dirty rectangles algorithm.

Authors: Mark Logan and Ian Langworth, Artillery
Improvements to error messages.
Merge pull request #427 from statico/dirty-rectangles

Improved dirty rectangles algorithm
Merge remote-tracking branch 'origin/master' into develop