- fix : removed duplicated code between ImageResizer and CanvasUtils
(disabledImageSmoothing utility method)
- added pskl.utils.UserAgent, basic user agent sniffer. I need it to sniff
out IE10 for frame rendering (and it's not possible to feature detect
here). Can check isChrome, isFirefox, isIE and get the version for each
of them
- added resizeNearestNeighbour in ImageResizer. Readapted from piskel
website, this allows us to 1 - resize without AA on IE10, and 2 - add a
pixel gap to reenable the GRID
- finally : added back support for GRID !
- also extracted the 'zoomed out background color' as a constant in
Constant.js
