remove usage of Hash.delete; closes issue 57
remove usage of Hash.delete; closes issue 57

cygx/panda,laben/panda,tadzik/panda,timo/panda,masak/panda,sjn/panda,hoelzro/panda,will-crawford/panda,jonathanstowe/panda,niner/panda,tadzik/panda,moznion/panda,skaji/panda,nbrown/panda,shoichikaji/panda,perlpilot/panda,raydiak/panda,masak/panda,laben/panda,moznion/panda,tadzik/panda,sjn/panda,niner/panda,timo/panda,dwarring/panda,hoelzro/panda,stmuk/panda,TimToady/panda,cygx/panda,stmuk/panda,dwarring/panda,dwarring/panda,will-crawford/panda,hoelzro/panda,perlpilot/panda,skaji/panda,TimToady/panda,raydiak/panda,jonathanstowe/panda,nbrown/panda,shoichikaji/panda,sjn/panda