Update changelog to reflect 2.2.5 release. Closes #1166.
Update changelog to reflect 2.2.5 release. Closes #1166.

aleksclark/mongoid,etomic/mongoid,rinmu/mongoid,kayakyakr/mongoid,kcdragon/mongoid,crowdtap/mongoid,charliehq/mongoid,rogerz42892/mongoid,skyeagle/mongoid,gicappa/mongoid,subhashb/mongoid,mikerobe/mongoid,Sharevari-Inc/mongoid,rebelhold/mongoid,Codas/mongoid,Numerico/mongoid,janroesner/mongoid,praecipula/mongoid,mysociety/mongoid,arnkorty/mongoid,ElvinEfendi/mongoid,stevebartholomew/mongoid,leemhenson/mongoid,nagachika/mongoid,manikandan-kandasamy/mongoid,tagliala/mongoid,kuadrosx/mongoid,xentek/mongoid,bdmac/mongoid,mongodb/mongoid,nusco/mongoid,bjori/mongoid,matbox/mongoid,goshakkk/mongoid,joshsoftware/mongoid,grossws/mongoid,jordoh/mongoid,kslazarev/mongoid,cao7113/mongoid,moretea/mongoid,KoanHealth/mongoid,dannguyen/mongoid,Flameeyes/mongoid,flada-auxv/mongoid,slbug/mongoid,cao7113/mongoid,asaaki/mongoid,stnguyen/mongoid,akirasosa/mongoid,robwil/mongoid,Azzurrio/mongoid,chetan/mongoid,itbakery/mongoid,niedhui/mongoid,mgartner/mongoid,neerfri/mongoid,hadees/mongoid,rubrikkfabrikken/mongoid,alex-klepa/mongoid,iboard/mongoid-1,priyaaank/mongoid,dnd/mongoid,Codas/mongoid,simi/mongoid,Winslett/mongoid,CIRCUITLLC/mongoid,jordoh/mongoid,joshleitzel/mongoid,Speakol/mongoid,loginx/mongoid,kentaroi/mongoid,fortnightlabs/mongoid,lawrencecurtis/mongoid,jamesalmond/mongoid,zaithottakath/mongoid,tzar/mongoid,joshsoftware/mongoid,jiren/mongoid,eljojo/mongoid,icambron/mongoid,Exoth/mongoid,lawrencecurtis/mongoid,evansagge/mongoid,akirasosa/mongoid,Tickaroo/mongoid2,i0rek/mongoid,Spaceghost/mongoid,tombruijn/mongoid,Welovroi/mongoid,ahoward/mongoid,Zhomart/mongoid,manuelmorales/mongoid,luxerama/mongoid,stevebartholomew/mongoid,asantamar/mongoid,zenjoy/mongoid,absperf/mongoid,evendis/mongoid,estolfo/mongoid,socialreferral/mongoid,neerfri/mongoid,drfeelngood/mongoid,kayakyakr/mongoid,amw/mongoid,camallen/mongoid,jbrien/mongoid,getaroom/mongoid,herimedia/mongoid,maxd/mongoid,jstrocel/mongoid,ganlron/mongoid,jonhyman/mongoid,apptentive-engineering/mongoid,bearded/mongoid,wuboy0307/mongoid,afeld/mongoid,joneslee85/mongoid,mongodb/mongoid,zanker/mongoid,codedogfish/mongoid,xentek/mongoid,rubrikkfabrikken/mongoid,mattconnolly/mongoid,hubertlepicki/mongoid,PerfectMemory/mongoid,jamesalmond/mongoid,dbkbali/mongoid,matbox/mongoid,johnny-miyake/mongoid,canvas-drw/mongoid,colinyoung/mongoid,bobbytables/mongoid,demarque/mongoid,akm/mongoid,spiegela/mongoid,leozhang37/mongoid,robwil/mongoid,arnkorty/mongoid,franc/mongoid,snapfish-soma/mongoid,joelcogen/mongoid,Azzurrio/mongoid,narutosanjiv/mongoid,sujal/mongoid,jordelver/mongoid,drobune/mongoid,lucasas/mongoid,karmakaze/mongoid,icambron/mongoid,wuboy0307/mongoid,gullitmiranda/mongoid,kslazarev/mongoid,alexandru-calinoiu/mongoid,ono/mongoid,rinmu/mongoid,dannguyen/mongoid,jstrocel/mongoid,narutosanjiv/mongoid,ganlron/mongoid,praecipula/mongoid,grossws/mongoid,rmm5t/mongoid,nullstyle/mongoid,zanker/mongoid,mongoid/mongoid,javmorin/mongoid,jordelver/mongoid,cmpolis/mongoid,afeld/mongoid,trmmy/mongoid,piotrj/mongoid,mongoid/mongoid,hadees/mongoid,genexp/mongoid,X0nic/mongoid,jbrien/mongoid,dustinwatson/mongoid,gicappa/mongoid,anuprit/mongoid,aj0strow/mongoid,timgluz/mongoid,itbakery/mongoid,cpuguy83/mongoid,lowang/mongoid,gregmolnar/mongoid,tengine/mongoid,maxd/mongoid,tricknotes/mongoid,mash-ltd/mongoid,amw/mongoid,lackac/mongoid,mschulkind/mongoid,chetan/mongoid,dustinwatson/mongoid,kcdragon/mongoid,nfo/mongoid,asantamar/mongoid,aileron/mongoid,canvas-drw/mongoid,spiegela/mongoid,500px/mongoid,voldy/mongoid,tricknotes/mongoid,infiverve/mongoid,mgartner/mongoid,mathieuravaux/mongoid,fredjean/mongoid,fbernier/mongoid,johnnyshields/mongoid,nviennot/mongoid,subhashb/mongoid,joshleitzel/mongoid,drfeelngood/mongoid,evansagge/mongoid,ErisExchange/mongoid,robinst/mongoid,blt04/mongoid,haihappen/mongoid,kostyantyn/mongoid,eljojo/mongoid,gregmolnar/mongoid,lucasas/mongoid,simi/mongoid,bjori/mongoid,irakli-janiashvili/mongoid,matsimitsu/mongoid,kuadrosx/mongoid,colinyoung/mongoid,fujimura/mongoid,dbkbali/mongoid,KoanHealth/mongoid,hashrocketeer/mongoid,Winslett/mongoid,bobbytables/mongoid,fbernier/mongoid,hfwang/mongoid,haihappen/mongoid,mzsanford/mongoid,kevinmarvin/mongoid,hxx/mongoid,tzar/mongoid,voldy/mongoid,Spaceghost/mongoid,slbug/mongoid,bencrouse/mongoid,razum2um/mongoid,tombruijn/mongoid,johnny-miyake/mongoid,grimen/mongoid,rpocklin/mongoid,env0der/mongoid,DouweM/mongoid,kay-kim/mongoid,77Agency/mongoid,jonhyman/mongoid,matsimitsu/mongoid,incorvia/mongoid,SumeruSoftware/mongoid,greggroth/mongoid,dblock/mongoid,tolsen/mongoid,mitio/mongoid,zenjoy/mongoid,socialreferral/mongoid,X0nic/mongoid,gullitmiranda/mongoid,franc/mongoid,cjab/mongoid,incorvia/mongoid,jasl/mongoid,ErisExchange/mongoid,nagachika/mongoid,romanbsd/mongoid,trmmy/mongoid,mikerobe/mongoid,dnd/mongoid,teaforthecat/mongoid,etomic/mongoid,johnnyshields/mongoid,Welovroi/mongoid,greggroth/mongoid,Zhomart/mongoid,mattconnolly/mongoid,krasnoukhov/mongoid,Subskii/mongoid,uranazo/mongoid,blackxored/mongoid,albus522/mongoid,camallen/mongoid,bencrouse/mongoid,CIRCUITLLC/mongoid,skiz/mongoid,moretea/mongoid,flexoid/mongoid,elia/mongoid,drobune/mongoid,aileron/mongoid,hashrocketeer/mongoid,demarque/mongoid,jeyb/mongoid,genexp/mongoid,shotoso/mongoid,herimedia/mongoid,nullstyle/mongoid,fortnightlabs/mongoid,nfo/mongoid,janroesner/mongoid,mash-ltd/mongoid,infiverve/mongoid,estolfo/mongoid,nicolasblanco/mongoid,ElvinEfendi/mongoid,wyattisimo/mongoid,rymai/mongoid,hbakhtiyor/mongoid,brynary/mongoid,PerfectMemory/mongoid,wyattisimo/mongoid,karmakaze/mongoid,uniiverse/mongoid,crowdtap/mongoid,hubertlepicki/mongoid,mzsanford/mongoid,mathieuravaux/mongoid,uranazo/mongoid,stnguyen/mongoid,astjohn/mongoid,hxx/mongoid,irakli-janiashvili/mongoid,byroot/mongoid,glebtv/mongoid,Speakol/mongoid,manuelmorales/mongoid,kevinmarvin/mongoid,abezzub/mongoid,kostyantyn/mongoid,luxerama/mongoid,tagliala/mongoid,asaaki/mongoid,rafaelgaspar/mongoid,niedhui/mongoid,krasnoukhov/mongoid,zaithottakath/mongoid,joelcogen/mongoid,captain-lucas/mongoid,nviennot/mongoid,koraktor/mongoid,fredjean/mongoid,cmpolis/mongoid,manikandan-kandasamy/mongoid,captain-lucas/mongoid,anuprit/mongoid,jeyb/mongoid,Subskii/mongoid,apptentive-engineering/mongoid,rogerz42892/mongoid,brynary/mongoid,semaperepelitsa/mongoid,aleksclark/mongoid,glebtv/mongoid,hbakhtiyor/mongoid,lackac/mongoid,shingara/mongoid,MadRabbit/mongoid,nusco/mongoid,jtescher/mongoid,sepastian/mongoid,sideci-sample/sideci-sample-mongoid,bearded/mongoid,flexoid/mongoid,balauru/mongoid,flada-auxv/mongoid,Exoth/mongoid,parov/mongoid,parov/mongoid,Houdini/mongoid,uniiverse/mongoid,mysociety/mongoid,bdmac/mongoid,javmorin/mongoid,hfwang/mongoid,mschulkind/mongoid,jasl/mongoid,akm/mongoid,blackxored/mongoid,rafaelgaspar/mongoid,imomoisoft/mongoid,charliehq/mongoid,crealytics/mongoid,rosylilly/mongoid,Sharevari-Inc/mongoid,SumeruSoftware/mongoid,razum2um/mongoid,balauru/mongoid,teaforthecat/mongoid,goshakkk/mongoid,crealytics/mongoid,mongodb/mongoid,sivagollapalli/mongoid,jtescher/mongoid,codedogfish/mongoid,sepastian/mongoid,rmm5t/mongoid,zBMNForks/mongoid,zBMNForks/mongoid,schnittchen/mongoid,Empact/mongoid,imomoisoft/mongoid,shotoso/mongoid,500px/mongoid,elia/mongoid,rpocklin/mongoid,rosylilly/mongoid,jonasschneider/mongoid,sivagollapalli/mongoid,sideci-sample/sideci-sample-mongoid,bigbenli/mongoid,evendis/mongoid,tolsen/mongoid,bigbenli/mongoid,joneslee85/mongoid,kay-kim/mongoid,abezzub/mongoid,ahoward/mongoid,shingara/mongoid,aj0strow/mongoid,Numerico/mongoid,dakatsuka/mongoid,kentaroi/mongoid,skiz/mongoid,77Agency/mongoid,timgluz/mongoid,lowang/mongoid,alexandru-calinoiu/mongoid,cpuguy83/mongoid