Add spec for $rename operation
Add spec for $rename operation

simi/mongoid,glebtv/mongoid,Sharevari-Inc/mongoid,parov/mongoid,zaithottakath/mongoid,estolfo/mongoid,zenjoy/mongoid,eljojo/mongoid,rpocklin/mongoid,mongodb/mongoid,nicolasblanco/mongoid,eljojo/mongoid,hashrocketeer/mongoid,bjori/mongoid,demarque/mongoid,itbakery/mongoid,zBMNForks/mongoid,rpocklin/mongoid,nviennot/mongoid,nusco/mongoid,karmakaze/mongoid,imomoisoft/mongoid,narutosanjiv/mongoid,rafaelgaspar/mongoid,bencrouse/mongoid,nusco/mongoid,arnkorty/mongoid,kcdragon/mongoid,cao7113/mongoid,herimedia/mongoid,subhashb/mongoid,sivagollapalli/mongoid,infiverve/mongoid,tzar/mongoid,Azzurrio/mongoid,stnguyen/mongoid,codedogfish/mongoid,uniiverse/mongoid,zenjoy/mongoid,trmmy/mongoid,codedogfish/mongoid,asantamar/mongoid,jonhyman/mongoid,jbrien/mongoid,uniiverse/mongoid,joshsoftware/mongoid,imomoisoft/mongoid,sivagollapalli/mongoid,tzar/mongoid,kay-kim/mongoid,herimedia/mongoid,canvas-drw/mongoid,glebtv/mongoid,itbakery/mongoid,mongodb/mongoid,wuboy0307/mongoid,narutosanjiv/mongoid,bencrouse/mongoid,hashrocketeer/mongoid,hxx/mongoid,bjori/mongoid,rafaelgaspar/mongoid,sideci-sample/sideci-sample-mongoid,cao7113/mongoid,mysociety/mongoid,Sharevari-Inc/mongoid,Zhomart/mongoid,Welovroi/mongoid,matbox/mongoid,mongoid/mongoid,trmmy/mongoid,kay-kim/mongoid,subhashb/mongoid,canvas-drw/mongoid,etomic/mongoid,simi/mongoid,amw/mongoid,johnny-miyake/mongoid,demarque/mongoid,mongoid/mongoid,nviennot/mongoid,drobune/mongoid,karmakaze/mongoid,rinmu/mongoid,Azzurrio/mongoid,hxx/mongoid,jonhyman/mongoid,asantamar/mongoid,stnguyen/mongoid,mongodb/mongoid,kcdragon/mongoid,estolfo/mongoid,kayakyakr/mongoid,zaithottakath/mongoid,Welovroi/mongoid,jbrien/mongoid,tricknotes/mongoid,sideci-sample/sideci-sample-mongoid,johnny-miyake/mongoid,Zhomart/mongoid,rinmu/mongoid,infiverve/mongoid,parov/mongoid,matbox/mongoid,tricknotes/mongoid,drobune/mongoid,kayakyakr/mongoid,amw/mongoid,wuboy0307/mongoid,arnkorty/mongoid,joshsoftware/mongoid,zBMNForks/mongoid,mysociety/mongoid,etomic/mongoid