install python-magic and wand on travis
install python-magic and wand on travis

CompassionCH/compassion-modules,maxime-beck/compassion-modules,MickSandoz/compassion-modules,maxime-beck/compassion-modules,eicher31/compassion-modules,philippe89/compassion-modules,ecino/compassion-modules,philippe89/compassion-modules,MickSandoz/compassion-modules,emgirardin/compassion-modules,eicher31/compassion-modules,eicher31/compassion-modules,CompassionCH/compassion-modules,eicher31/compassion-modules,maxime-beck/compassion-modules,ecino/compassion-modules,maxime-beck/compassion-modules,CompassionCH/compassion-modules,ecino/compassion-modules,ecino/compassion-modules,eicher31/compassion-modules,MickSandoz/compassion-modules,emgirardin/compassion-modules,CompassionCH/compassion-modules,emgirardin/compassion-modules,philippe89/compassion-modules,ecino/compassion-modules