Fix Rails 3.1 compatibility broken by observers. Fixes #773
Fix Rails 3.1 compatibility broken by observers. Fixes #773

wyattisimo/mongoid,adyard/mongoid,sserdyuk/mongoid,akm/mongoid,anuprit/mongoid,ElvinEfendi/mongoid,estolfo/mongoid,aleksclark/mongoid,ganlron/mongoid,estolfo/mongoid,mash-ltd/mongoid,arnkorty/mongoid,kuruma-gs/mongoid,socialreferral/mongoid,maxd/mongoid,karmakaze/mongoid,voldy/mongoid,mysociety/mongoid,mattconnolly/mongoid,parov/mongoid,chriseppstein/mongoid,spiegela/mongoid,rafaelgaspar/mongoid,cavneb/mongoid,stnguyen/mongoid,blackxored/mongoid,abezzub/mongoid,akirasosa/mongoid,cleishm/mongoid,blackxored/mongoid,incorvia/mongoid,canavese/mongoid,ginty/mongoid,4pcbr/mongoid,jamesalmond/mongoid,snapfish-soma/mongoid,Azzurrio/mongoid,kayakyakr/mongoid,piotrj/mongoid,wuboy0307/mongoid,kslazarev/mongoid,uniiverse/mongoid,jstrocel/mongoid,arunagw/mongoid,johnny-miyake/mongoid,javmorin/mongoid,etomic/mongoid,nfo/mongoid,X0nic/mongoid,mulder/mongoid,bjori/mongoid,teaforthecat/mongoid,shotoso/mongoid,johnny-miyake/mongoid,Sharevari-Inc/mongoid,niedhui/mongoid,brettgoulder/mongoid-1,crealytics/mongoid,aagrawal2001/mongoid,voldy/mongoid,asaaki/mongoid,mathieuravaux/mongoid,jetthoughts/mongoid,xentek/mongoid,wuboy0307/mongoid,alexandru-calinoiu/mongoid,tagliala/mongoid,jeffreyiacono/mongoid,tetsuo692/mongoid,MSNexploder/mongoid,cao7113/mongoid,robwil/mongoid,narutosanjiv/mongoid,MadRabbit/mongoid,asantamar/mongoid,pkieltyka/mongoid,neerfri/mongoid,elia/mongoid,nextmat/mongoid,romanbsd/mongoid,krasnoukhov/mongoid,stellard/mongoid,drobune/mongoid,EqualMedia/mongoid,codedogfish/mongoid,jordoh/mongoid,Aupajo/mongoid-1,skippy/mongoid,malditogeek/mongoid,iamnader/mongoid-2,cpuguy83/mongoid,atomical/mongoid,greggroth/mongoid,Codas/mongoid,stellard/mongoid,Numerico/mongoid,tzar/mongoid,jetthoughts/mongoid,nagachika/mongoid,sporkd/mongoid,Welovroi/mongoid,mitio/mongoid,bobbytables/mongoid,icambron/mongoid,gicappa/mongoid,canavese/mongoid,ches/mongoid,mongoid/mongoid,Spaceghost/mongoid,ebeigarts/mongoid,alexandru-calinoiu/mongoid,lucasas/mongoid,500px/mongoid,drobune/mongoid,flexoid/mongoid,freerange/mongoid,janroesner/mongoid,apptentive-engineering/mongoid,hfwang/mongoid,matadon/mongoid,eddanger/mongoid,joshleitzel/mongoid,arnkorty/mongoid,toppan-forms/mongoid,tombruijn/mongoid,mongodb/mongoid,shingara/mongoid,gregory-m/mongoid,bencrouse/mongoid,rmm5t/mongoid,tvon/mongoid,simi/mongoid,mattconnolly/mongoid,florent/mongoid,stevebartholomew/mongoid,CIRCUITLLC/mongoid,bdmac/mongoid,akirasosa/mongoid,tolsen/mongoid,praecipula/mongoid,ono/mongoid,eljojo/mongoid,stnguyen/mongoid,itbakery/mongoid,parov/mongoid,marcweil/mongoid,dustinwatson/mongoid,mgartner/mongoid,aj0strow/mongoid,mitijain123/mongoid,joelcogen/mongoid,codedogfish/mongoid,msaffitz/mongoid,alexrothenberg/mongoid,karmakaze/mongoid,mitijain123/mongoid,greggroth/mongoid,nviennot/mongoid,Tickaroo/mongoid2,mathieuravaux/mongoid,albus522/mongoid,fredjean/mongoid,sivagollapalli/mongoid,rinmu/mongoid,theirishpenguin/mongoid,mikerobe/mongoid,dsachitano/mongoid,Speakol/mongoid,bobbytables/mongoid,alex-klepa/mongoid,jtescher/mongoid,tricknotes/mongoid,matbox/mongoid,canvas-drw/mongoid,kentaroi/mongoid,demarque/mongoid,tagliala/mongoid,FestivalBobcats/mongoid,matsimitsu/mongoid,praecipula/mongoid,niedhui/mongoid,jim/mongoid,HeeL/mongoid-1,dnd/mongoid,sukeerthiadiga/mongoid,imomoisoft/mongoid,travis-repos/mongoid,alexrothenberg/mongoid,leedo/mongoid,balauru/mongoid,hbakhtiyor/mongoid,florent/mongoid,kryzhovnik/mongoid,env0der/mongoid,ahoward/mongoid,jonhyman/mongoid,canvas-drw/mongoid,iGoDigital-LLC/mongoid,amw/mongoid,uranazo/mongoid,manikandan-kandasamy/mongoid,bearded/mongoid,trmmy/mongoid,fortnightlabs/mongoid,brynary/mongoid,Flameeyes/mongoid,crowdtap/mongoid,jamesalmond/mongoid,KoanHealth/mongoid,jasl/mongoid,manuelmorales/mongoid,neerfri/mongoid,nickhoffman/mongoid,robotmay/mongoid,abezzub/mongoid,evansagge/mongoid,i0rek/mongoid,gregory-m/mongoid,koraktor/mongoid,skippy/mongoid,captain-lucas/mongoid,aj0strow/mongoid,zBMNForks/mongoid,nullstyle/mongoid,goshakkk/mongoid,rosylilly/mongoid,brettgoulder/mongoid-1,luxerama/mongoid,schnittchen/mongoid,Azzurrio/mongoid,charliehq/mongoid,incorvia/mongoid,moretea/mongoid,abscondment/mongoid,kuadrosx/mongoid,zanker/mongoid,stevebartholomew/mongoid,kay-kim/mongoid,itbakery/mongoid,gullitmiranda/mongoid,genexp/mongoid,sukeerthiadiga/mongoid,kevinmarvin/mongoid,hubertlepicki/mongoid,Exoth/mongoid,nagachika/mongoid,herimedia/mongoid,evansagge/mongoid,shotoso/mongoid,tengine/mongoid,jakcharlton/mongoid,uniiverse/mongoid,zenjoy/mongoid,javmorin/mongoid,rogerz42892/mongoid,leemhenson/mongoid,balauru/mongoid,dbkbali/mongoid,flada-auxv/mongoid,crealytics/mongoid,mgartner/mongoid,asaaki/mongoid,PerfectMemory/mongoid,rmm5t/mongoid,etomic/mongoid,jiren/mongoid,rpocklin/mongoid,absperf/mongoid,uranazo/mongoid,grossws/mongoid,cavneb/mongoid,iboard/mongoid-1,Shop2market/mongoid,justinko/mongoid,camallen/mongoid,DanielVartanov/mongoid,moretea/mongoid,77Agency/mongoid,Welovroi/mongoid,Zhomart/mongoid,hadees/mongoid,tetsuo692/mongoid,blt04/mongoid,socialreferral/mongoid,janroesner/mongoid,timgluz/mongoid,lowang/mongoid,aileron/mongoid,teaforthecat/mongoid,crowdtap/mongoid,haihappen/mongoid,joelcogen/mongoid,astjohn/mongoid,grimen/mongoid,jasonsydes/mongoid,lawrencecurtis/mongoid,Winslett/mongoid,Subskii/mongoid,manikandan-kandasamy/mongoid,elia/mongoid,sivagollapalli/mongoid,aleksclark/mongoid,grossws/mongoid,subhashb/mongoid,semaperepelitsa/mongoid,jonasschneider/mongoid,lowang/mongoid,freerange/mongoid,luxerama/mongoid,subhashb/mongoid,DanielVartanov/mongoid,likealittle/mongoid,imomoisoft/mongoid,kuruma-gs/mongoid,drfeelngood/mongoid,abscondment/mongoid,hookercookerman/mongoid,jakcharlton/mongoid,bdmac/mongoid,joneslee85/mongoid,chetan/mongoid,sserdyuk/mongoid,zBMNForks/mongoid,afeld/mongoid,zanker/mongoid,SumeruSoftware/mongoid,kcdragon/mongoid,ches/mongoid,loginx/mongoid,toppan-forms/mongoid,Subskii/mongoid,Zhomart/mongoid,kcdragon/mongoid,kentaroi/mongoid,kostyantyn/mongoid,hubertlepicki/mongoid,mulder/mongoid,HeeL/mongoid-1,lackac/mongoid,bigbenli/mongoid,dannguyen/mongoid,apptentive-engineering/mongoid,wyattisimo/mongoid,cleishm/mongoid,infiverve/mongoid,colinyoung/mongoid,ebeigarts/mongoid,ryanong/mongoid,tzar/mongoid,atomical/mongoid,flada-auxv/mongoid,haihappen/mongoid,nfo/mongoid,anuprit/mongoid,kuadrosx/mongoid,derickbailey/mongoid,cao7113/mongoid,EqualMedia/mongoid,rymai/mongoid,mysociety/mongoid,xentek/mongoid,FestivalBobcats/mongoid,gregmolnar/mongoid,robinst/mongoid,rafaelfranca/mongoid,herimedia/mongoid,flexoid/mongoid,charliehq/mongoid,dakatsuka/mongoid,mgolovnia/mongoid,Speakol/mongoid,jetheredge/mongoid,caiofilipini/mongoid,joshleitzel/mongoid,jordelver/mongoid,MSNexploder/mongoid,shingara/mongoid,mongoid/mongoid,travis-repos/mongoid,arunagw/mongoid,hxx/mongoid,tvon/mongoid,notxarb/mongoid,hfwang/mongoid,jordoh/mongoid,joshsoftware/mongoid,mikerobe/mongoid,cpuguy83/mongoid,fredjean/mongoid,kostyantyn/mongoid,chetan/mongoid,Empact/mongoid,rafaelgaspar/mongoid,cmpolis/mongoid,bigbenli/mongoid,jeyb/mongoid,fbernier/mongoid,hxx/mongoid,irakli-janiashvili/mongoid,cjab/mongoid,lucasas/mongoid,rubrikkfabrikken/mongoid,SumeruSoftware/mongoid,krasnoukhov/mongoid,tolsen/mongoid,rogerz42892/mongoid,nullstyle/mongoid,PerfectMemory/mongoid,Numerico/mongoid,kay-kim/mongoid,mschulkind/mongoid,ElvinEfendi/mongoid,hookercookerman/mongoid,simi/mongoid,byroot/mongoid,jim/mongoid,amw/mongoid,korishev/mongoid,adyard/mongoid,jasl/mongoid,jbrien/mongoid,tombruijn/mongoid,marcweil/mongoid,LastStar/mongoid,bearded/mongoid,Codas/mongoid,lawrencecurtis/mongoid,slbug/mongoid,dnd/mongoid,sideci-sample/sideci-sample-mongoid,Houdini/mongoid,infiverve/mongoid,rafaelfranca/mongoid,4pcbr/mongoid,johnnyshields/mongoid,mongodb/mongoid,franc/mongoid,capnregex/mongoid,sepastian/mongoid,matsimitsu/mongoid,sepastian/mongoid,skiz/mongoid,jstrocel/mongoid,nextmat/mongoid,hbakhtiyor/mongoid,fujimura/mongoid,nusco/mongoid,dbkbali/mongoid,narutosanjiv/mongoid,bencrouse/mongoid,brynary/mongoid,razum2um/mongoid,kslazarev/mongoid,justinko/mongoid,nviennot/mongoid,hashrocketeer/mongoid,ahoward/mongoid,derickbailey/mongoid,zenjoy/mongoid,mongodb/mongoid,rosylilly/mongoid,gullitmiranda/mongoid,razum2um/mongoid,nusco/mongoid,bjori/mongoid,ErisExchange/mongoid,colinyoung/mongoid,ryanong/mongoid,zaithottakath/mongoid,slbug/mongoid,cmpolis/mongoid,joshsoftware/mongoid,maxd/mongoid,KoanHealth/mongoid,robwil/mongoid,77Agency/mongoid,mzsanford/mongoid,rubrikkfabrikken/mongoid,dsachitano/mongoid,caiofilipini/mongoid,getaroom/mongoid,lackac/mongoid,CIRCUITLLC/mongoid,X0nic/mongoid,korishev/mongoid,dustinwatson/mongoid,iGoDigital-LLC/mongoid,Sharevari-Inc/mongoid,potatosalad/mongoid,pkieltyka/mongoid,malditogeek/mongoid,Spaceghost/mongoid,rebelhold/mongoid,mschulkind/mongoid,dblock/mongoid,glebtv/mongoid,notxarb/mongoid,matbox/mongoid,sujal/mongoid,potatosalad/mongoid,priyaaank/mongoid,mash-ltd/mongoid,sideci-sample/sideci-sample-mongoid,fbernier/mongoid,skyeagle/mongoid,leozhang37/mongoid,sporkd/mongoid,kryzhovnik/mongoid,ginty/mongoid,gicappa/mongoid,manuelmorales/mongoid,glebtv/mongoid,goshakkk/mongoid,dannguyen/mongoid,500px/mongoid,msaffitz/mongoid,skiz/mongoid,icambron/mongoid,Exoth/mongoid,franc/mongoid,captain-lucas/mongoid,HRNewMedia/mongoid,mzsanford/mongoid,asantamar/mongoid,rinmu/mongoid,jtescher/mongoid,johnnyshields/mongoid,camallen/mongoid,jbrien/mongoid,nickhoffman/mongoid,jonhyman/mongoid,zaithottakath/mongoid,eljojo/mongoid,joneslee85/mongoid,leedo/mongoid,ErisExchange/mongoid,DouweM/mongoid,kayakyakr/mongoid,evendis/mongoid,drfeelngood/mongoid,irakli-janiashvili/mongoid,trmmy/mongoid,aileron/mongoid,hashrocketeer/mongoid,spiegela/mongoid,ganlron/mongoid,hadees/mongoid,gregmolnar/mongoid,evendis/mongoid,Winslett/mongoid,kevinmarvin/mongoid,aagrawal2001/mongoid,chriseppstein/mongoid,tricknotes/mongoid,jeffreyiacono/mongoid,LastStar/mongoid,timgluz/mongoid,eddanger/mongoid,demarque/mongoid,genexp/mongoid,fortnightlabs/mongoid,afeld/mongoid,jordelver/mongoid,rpocklin/mongoid,akm/mongoid,nicolasblanco/mongoid,jeyb/mongoid