PLF-6019 : Fix dev mode for windows

IF doesn't support to have several SET commands (details : http://stackoverflow.com/a/14190037)
SWF-2923 : Create pkg-improv branch and update projects versions

Signed-off-by: Arnaud Héritier <aheritier@exoplatform.com>
PLF-5898 : Use the SNAPSHOT version of the add-ons manager