Update README.md
Objects's design.
Functionnalize to give another option : -a

-a let download addons accordingly to addons.make file, and that's all!
Merge branch 'master' into per-object-ui-implementation
Project changes
Merge branch 'per-object-ui-implementation' of github.com:groolot/vilain into per-object-ui-implementation

Conflicts:
	src/vilainObject.h
	vilain.layout