update dev dependencies
update dev dependencies (again :-)
Merge pull request #124 from rejas/master

update dev dependencies
fix window onresize
update minified version
Merge pull request #126 from dmkuznetsov/fix-onresize

Fix onresize
update dev dependencies
Bugfix for opacity

globalAlpha was not set correctly
Merge pull request #128 from andersevenrud/master

Bugfix for opacity
update dev dependencies
Fixed bug with clearing offscreen drops
Merge pull request #135 from prontiol/master

Fixed bug with clearing offscreen drops
Update README.md

there is no 'element' property, but 'image' is
Merge pull request #136 from mjrev/patch-1

Update README.md
Merge pull request #5 from maroslaw/master

update from source