Update to 0.4.0, ok ajacoutot@
changes:
* Complete reorganisation of the interface and the code
* Only allocate necessary memory
* Support unlimited number of icons
* Automagically create another dock when the first one is full
* --width and --height available, superseeding --vertical and --square
* --multiple is default now, removed it and added --no-multiple
* Fix bug of some applications (grip, castpodder...) having their icons at 0,0
