RequirementMachine: Add a simple Histogram data structure
RequirementMachine: Add a simple Histogram data structure

rudkx/swift,benlangmuir/swift,hooman/swift,hooman/swift,apple/swift,rudkx/swift,glessard/swift,benlangmuir/swift,hooman/swift,atrick/swift,hooman/swift,xwu/swift,roambotics/swift,ahoppen/swift,JGiola/swift,roambotics/swift,benlangmuir/swift,hooman/swift,apple/swift,atrick/swift,atrick/swift,apple/swift,JGiola/swift,glessard/swift,glessard/swift,gregomni/swift,apple/swift,benlangmuir/swift,JGiola/swift,xwu/swift,hooman/swift,roambotics/swift,apple/swift,ahoppen/swift,roambotics/swift,gregomni/swift,ahoppen/swift,glessard/swift,xwu/swift,xwu/swift,JGiola/swift,gregomni/swift,roambotics/swift,rudkx/swift,rudkx/swift,benlangmuir/swift,rudkx/swift,atrick/swift,xwu/swift,gregomni/swift,atrick/swift,JGiola/swift,ahoppen/swift,ahoppen/swift,rudkx/swift,hooman/swift,benlangmuir/swift,gregomni/swift,JGiola/swift,roambotics/swift,apple/swift,gregomni/swift,ahoppen/swift,atrick/swift,glessard/swift,xwu/swift,xwu/swift,glessard/swift