Bug#1010911: RM: gajim-plugininstaller/experimental -- RoM; obsoleted by gajim 1.4.0

[Martin]

Control: reopen -1
Control: retitle -1 RM: gajim-plugininstaller/experimental -- RoM; obsoleted by 
gajim 1.4.0

gajim-plugininstaller should be removed from experimental, too.
It's not urgent, of course.