radial gradient background on FX
Merge pull request #108 from captainbrosset/master

i can haz cross-browser css3 gradient
correct slider init value and better FX slider event handling
Added back the -webkit prefix for radial-gradient used on body
Merge branch 'slider-init' of https://github.com/captainbrosset/piskel into captainbrosset-slider-init
Reverted back to onchange due to lack of support of input range in firefox 21
Merge branch 'master' into user-settings