01 - Run grunt desktop on mac os x
02 - Retrieve piskel.new.dmg.zip on Dropbox. Unzip it.
03 - Retrieve nw.icns on Dropbox
04 - Go to piskel/dest/desktop/releases/mac ; copy piskel.app to your working directory
05 - Expand piskel.app
06 - Replace nw.icns by the one from dropbox in Contents/Resources
07 - Open piskel.new.dmg
08 - Drag and drop piskel.app in it
09 - Update readme.txt
10 - Open disk utility, and open piskel.new.dmg in it
11 - Convert image, piskel-x.y.z.dmg
12 - Upload to Dropbox