added simplejson into the requirements for python 2.5
added simplejson into the requirements for python 2.5

FinnStutzenstein/OpenSlides,ostcar/OpenSlides,jwinzer/OpenSlides,tsiegleauq/OpenSlides,boehlke/OpenSlides,emanuelschuetze/OpenSlides,jwinzer/OpenSlides,normanjaeckel/OpenSlides,CatoTH/OpenSlides,OpenSlides/OpenSlides,normanjaeckel/OpenSlides,CatoTH/OpenSlides,boehlke/OpenSlides,rolandgeider/OpenSlides,OpenSlides/OpenSlides,normanjaeckel/OpenSlides,ostcar/OpenSlides,emanuelschuetze/OpenSlides,FinnStutzenstein/OpenSlides,FinnStutzenstein/OpenSlides,FinnStutzenstein/OpenSlides,CatoTH/OpenSlides,emanuelschuetze/OpenSlides,normanjaeckel/OpenSlides,rolandgeider/OpenSlides,jwinzer/OpenSlides,rolandgeider/OpenSlides,jwinzer/OpenSlides,tsiegleauq/OpenSlides,boehlke/OpenSlides,emanuelschuetze/OpenSlides,boehlke/OpenSlides,tsiegleauq/OpenSlides,jwinzer/OpenSlides,ostcar/OpenSlides,CatoTH/OpenSlides