Ensure we use mongoid's validators. Fixes #1993.
Ensure we use mongoid's validators. Fixes #1993.

evansagge/mongoid,gullitmiranda/mongoid,karmakaze/mongoid,nagachika/mongoid,cpuguy83/mongoid,hxx/mongoid,manikandan-kandasamy/mongoid,mikerobe/mongoid,flexoid/mongoid,alexandru-calinoiu/mongoid,tombruijn/mongoid,narutosanjiv/mongoid,jonhyman/mongoid,imomoisoft/mongoid,rogerz42892/mongoid,hbakhtiyor/mongoid,dannguyen/mongoid,socialreferral/mongoid,sivagollapalli/mongoid,zanker/mongoid,flexoid/mongoid,nviennot/mongoid,zBMNForks/mongoid,colinyoung/mongoid,franc/mongoid,fbernier/mongoid,tricknotes/mongoid,KoanHealth/mongoid,robwil/mongoid,itbakery/mongoid,Sharevari-Inc/mongoid,hxx/mongoid,lackac/mongoid,Exoth/mongoid,kslazarev/mongoid,camallen/mongoid,mattconnolly/mongoid,KoanHealth/mongoid,javmorin/mongoid,mongodb/mongoid,lucasas/mongoid,voldy/mongoid,bearded/mongoid,timgluz/mongoid,Spaceghost/mongoid,afeld/mongoid,trmmy/mongoid,amw/mongoid,herimedia/mongoid,rmm5t/mongoid,tolsen/mongoid,mattconnolly/mongoid,rmm5t/mongoid,tombruijn/mongoid,itbakery/mongoid,joneslee85/mongoid,mzsanford/mongoid,maxd/mongoid,icambron/mongoid,mzsanford/mongoid,bjori/mongoid,eljojo/mongoid,parov/mongoid,codedogfish/mongoid,joshsoftware/mongoid,rafaelgaspar/mongoid,jtescher/mongoid,uranazo/mongoid,Numerico/mongoid,greggroth/mongoid,Zhomart/mongoid,77Agency/mongoid,Winslett/mongoid,joshleitzel/mongoid,ganlron/mongoid,dbkbali/mongoid,evansagge/mongoid,kostyantyn/mongoid,Welovroi/mongoid,aleksclark/mongoid,Azzurrio/mongoid,jbrien/mongoid,arnkorty/mongoid,akm/mongoid,joelcogen/mongoid,apptentive-engineering/mongoid,incorvia/mongoid,teaforthecat/mongoid,kayakyakr/mongoid,drfeelngood/mongoid,evendis/mongoid,cao7113/mongoid,joneslee85/mongoid,Subskii/mongoid,demarque/mongoid,trmmy/mongoid,asantamar/mongoid,akirasosa/mongoid,janroesner/mongoid,abezzub/mongoid,crealytics/mongoid,stnguyen/mongoid,Speakol/mongoid,maxd/mongoid,tolsen/mongoid,nusco/mongoid,drobune/mongoid,hashrocketeer/mongoid,evendis/mongoid,zaithottakath/mongoid,moretea/mongoid,akm/mongoid,sepastian/mongoid,shotoso/mongoid,bobbytables/mongoid,colinyoung/mongoid,lawrencecurtis/mongoid,neerfri/mongoid,manuelmorales/mongoid,tagliala/mongoid,hfwang/mongoid,canvas-drw/mongoid,spiegela/mongoid,X0nic/mongoid,skiz/mongoid,genexp/mongoid,500px/mongoid,hashrocketeer/mongoid,drfeelngood/mongoid,skiz/mongoid,xentek/mongoid,johnnyshields/mongoid,mysociety/mongoid,jbrien/mongoid,dbkbali/mongoid,glebtv/mongoid,narutosanjiv/mongoid,luxerama/mongoid,gregmolnar/mongoid,hbakhtiyor/mongoid,asaaki/mongoid,simi/mongoid,tagliala/mongoid,gregmolnar/mongoid,sivagollapalli/mongoid,jordoh/mongoid,goshakkk/mongoid,lowang/mongoid,incorvia/mongoid,mikerobe/mongoid,bencrouse/mongoid,ErisExchange/mongoid,blackxored/mongoid,dnd/mongoid,codedogfish/mongoid,estolfo/mongoid,goshakkk/mongoid,ErisExchange/mongoid,bobbytables/mongoid,jordelver/mongoid,bdmac/mongoid,robwil/mongoid,eljojo/mongoid,genexp/mongoid,chetan/mongoid,chetan/mongoid,aileron/mongoid,subhashb/mongoid,flada-auxv/mongoid,nusco/mongoid,rafaelgaspar/mongoid,herimedia/mongoid,bigbenli/mongoid,mash-ltd/mongoid,hadees/mongoid,jonhyman/mongoid,rubrikkfabrikken/mongoid,jstrocel/mongoid,stevebartholomew/mongoid,grossws/mongoid,ElvinEfendi/mongoid,glebtv/mongoid,zenjoy/mongoid,aileron/mongoid,zanker/mongoid,fortnightlabs/mongoid,wyattisimo/mongoid,rpocklin/mongoid,krasnoukhov/mongoid,mysociety/mongoid,Winslett/mongoid,kayakyakr/mongoid,Welovroi/mongoid,xentek/mongoid,Codas/mongoid,matbox/mongoid,niedhui/mongoid,mathieuravaux/mongoid,haihappen/mongoid,asantamar/mongoid,kevinmarvin/mongoid,demarque/mongoid,aj0strow/mongoid,77Agency/mongoid,kentaroi/mongoid,kcdragon/mongoid,luxerama/mongoid,Zhomart/mongoid,joelcogen/mongoid,gicappa/mongoid,janroesner/mongoid,kentaroi/mongoid,dustinwatson/mongoid,grossws/mongoid,crealytics/mongoid,brynary/mongoid,manikandan-kandasamy/mongoid,Numerico/mongoid,rosylilly/mongoid,rinmu/mongoid,sideci-sample/sideci-sample-mongoid,crowdtap/mongoid,mongoid/mongoid,razum2um/mongoid,blackxored/mongoid,praecipula/mongoid,joshleitzel/mongoid,captain-lucas/mongoid,canvas-drw/mongoid,jeyb/mongoid,cao7113/mongoid,jasl/mongoid,Exoth/mongoid,kay-kim/mongoid,cmpolis/mongoid,SumeruSoftware/mongoid,ElvinEfendi/mongoid,joshsoftware/mongoid,nullstyle/mongoid,dustinwatson/mongoid,jordoh/mongoid,fortnightlabs/mongoid,karmakaze/mongoid,johnny-miyake/mongoid,amw/mongoid,kslazarev/mongoid,subhashb/mongoid,rosylilly/mongoid,bencrouse/mongoid,neerfri/mongoid,infiverve/mongoid,krasnoukhov/mongoid,lackac/mongoid,mash-ltd/mongoid,elia/mongoid,zenjoy/mongoid,lucasas/mongoid,spiegela/mongoid,gullitmiranda/mongoid,teaforthecat/mongoid,Sharevari-Inc/mongoid,jordelver/mongoid,niedhui/mongoid,irakli-janiashvili/mongoid,hadees/mongoid,bdmac/mongoid,mongoid/mongoid,mschulkind/mongoid,flada-auxv/mongoid,rubrikkfabrikken/mongoid,bigbenli/mongoid,estolfo/mongoid,crowdtap/mongoid,kostyantyn/mongoid,balauru/mongoid,stevebartholomew/mongoid,anuprit/mongoid,lowang/mongoid,captain-lucas/mongoid,gicappa/mongoid,fredjean/mongoid,drobune/mongoid,CIRCUITLLC/mongoid,arnkorty/mongoid,wyattisimo/mongoid,mongodb/mongoid,Speakol/mongoid,johnnyshields/mongoid,socialreferral/mongoid,PerfectMemory/mongoid,X0nic/mongoid,Azzurrio/mongoid,imomoisoft/mongoid,tzar/mongoid,uranazo/mongoid,javmorin/mongoid,stnguyen/mongoid,camallen/mongoid,parov/mongoid,irakli-janiashvili/mongoid,kcdragon/mongoid,afeld/mongoid,elia/mongoid,tzar/mongoid,uniiverse/mongoid,greggroth/mongoid,charliehq/mongoid,rogerz42892/mongoid,voldy/mongoid,etomic/mongoid,kevinmarvin/mongoid,fbernier/mongoid,Subskii/mongoid,manuelmorales/mongoid,mgartner/mongoid,charliehq/mongoid,rinmu/mongoid,cmpolis/mongoid,anuprit/mongoid,nullstyle/mongoid,jstrocel/mongoid,etomic/mongoid,dannguyen/mongoid,mathieuravaux/mongoid,mschulkind/mongoid,dnd/mongoid,jasl/mongoid,ahoward/mongoid,franc/mongoid,aj0strow/mongoid,johnny-miyake/mongoid,Codas/mongoid,asaaki/mongoid,nviennot/mongoid,akirasosa/mongoid,jeyb/mongoid,zaithottakath/mongoid,timgluz/mongoid,sideci-sample/sideci-sample-mongoid,matsimitsu/mongoid,fredjean/mongoid,mgartner/mongoid,alexandru-calinoiu/mongoid,brynary/mongoid,kay-kim/mongoid,cpuguy83/mongoid,simi/mongoid,uniiverse/mongoid,razum2um/mongoid,jtescher/mongoid,nagachika/mongoid,infiverve/mongoid,wuboy0307/mongoid,Spaceghost/mongoid,haihappen/mongoid,nicolasblanco/mongoid,kuadrosx/mongoid,slbug/mongoid,aleksclark/mongoid,wuboy0307/mongoid,bjori/mongoid,matsimitsu/mongoid,apptentive-engineering/mongoid,icambron/mongoid,abezzub/mongoid,matbox/mongoid,SumeruSoftware/mongoid,shotoso/mongoid,bearded/mongoid,kuadrosx/mongoid,moretea/mongoid,500px/mongoid,mongodb/mongoid,slbug/mongoid,ahoward/mongoid,rpocklin/mongoid,jamesalmond/mongoid,balauru/mongoid,zBMNForks/mongoid,ganlron/mongoid,tricknotes/mongoid,hfwang/mongoid,CIRCUITLLC/mongoid,praecipula/mongoid,jamesalmond/mongoid,lawrencecurtis/mongoid,sepastian/mongoid,PerfectMemory/mongoid