added a TaggedHolder to allow for tag based reduce-side joins. Added RemoveProperties operation to remove properties from a vertex.
added a TaggedHolder to allow for tag based reduce-side joins. Added RemoveProperties operation to remove properties from a vertex.

dylanht/titan,nvoron23/titan,amcp/titan,graben1437/titan,tomersagi/titan,ThiagoGarciaAlves/titan,elubow/titan,elubow/titan,tomersagi/titan,kangkot/titan,fengshao0907/titan,wangbf/titan,thinkaurelius/titan,elkingtonmcb/titan,graben1437/titan,mbrukman/titan,englishtown/titan,samanalysis/titan,xlcupid/titan,jamestyack/titan,amcp/titan,mwpnava/titan,anuragkh/titan,jankotek/titan,nvoron23/titan,banjiewen/titan,hortonworks/titan,hortonworks/titan,jamestyack/titan,amcp/titan,graben1437/titan,anuragkh/titan,elkingtonmcb/titan,kalatestimine/titan,nvoron23/titan,pluradj/titan,evanv/titan,fengshao0907/titan,kalatestimine/titan,mbrukman/titan,thinkaurelius/faunus,kangkot/titan,kangkot/titan,jamestyack/titan,CYPP/titan,xlcupid/titan,samanalysis/titan,samanalysis/titan,graben1437/titan,qiuqiyuan/titan,elubow/titan,amcp/titan,thinkaurelius/titan,banjiewen/titan,anuragkh/titan,kalatestimine/titan,tomersagi/titan,hortonworks/titan,fengshao0907/titan,mwpnava/titan,xlcupid/titan,banjiewen/titan,ThiagoGarciaAlves/titan,fengshao0907/titan,elkingtonmcb/titan,mbrukman/titan,wangbf/titan,evanv/titan,jamestyack/titan,tomersagi/titan,elkingtonmcb/titan,anuragkh/titan,wangbf/titan,wangbf/titan,mwpnava/titan,thinkaurelius/faunus,tomersagi/titan,elubow/titan,jankotek/titan,pluradj/titan,jamestyack/titan,qiuqiyuan/titan,samanalysis/titan,evanv/titan,pluradj/titan,qiuqiyuan/titan,xlcupid/titan,mwpnava/titan,anuragkh/titan,ThiagoGarciaAlves/titan,pluradj/titan,banjiewen/titan,dylanht/titan,kalatestimine/titan,thinkaurelius/titan,thinkaurelius/titan,hortonworks/titan,hortonworks/titan,evanv/titan,xlcupid/titan,qiuqiyuan/titan,mbrukman/titan,kangkot/titan,CYPP/titan,englishtown/titan,mbrukman/titan,dylanht/titan,englishtown/titan,kalatestimine/titan,jankotek/titan,mwpnava/titan,wangbf/titan,nvoron23/titan,CYPP/titan,englishtown/titan,ThiagoGarciaAlves/titan,jankotek/titan,CYPP/titan,elkingtonmcb/titan,ThiagoGarciaAlves/titan,fengshao0907/titan,evanv/titan,kangkot/titan,jankotek/titan,qiuqiyuan/titan,dylanht/titan