improve the UI of the OSX installer
currently the dmg created using the .app directory will simply mount a volume containing the .app directory. the user must then manually drag the .app directory into the /Applications directory. we need to figure out how to make the dmg open one of those fancy windows with the app icon and an arrow pointing to the Applications directory (mac users should know what i mean)
(from redmine: created on 2012-06-21, relates #61 (closed))