[ci skip] update rails version to 3.2.21
[ci skip] update rails version to 3.2.21

vipulnsward/rails,EmmaB/rails-1,lcreid/rails,kachick/rails,MSP-Greg/rails,kmayer/rails,mechanicles/rails,yalab/rails,pvalena/rails,untidy-hair/rails,Vasfed/rails,rails/rails,MichaelSp/rails,kmayer/rails,illacceptanything/illacceptanything,samphilipd/rails,untidy-hair/rails,88rabbit/newRails,gavingmiller/rails,mechanicles/rails,sergey-alekseev/rails,Erol/rails,printercu/rails,gcourtemanche/rails,yalab/rails,riseshia/railsguides.kr,ledestin/rails,yawboakye/rails,pvalena/rails,Sen-Zhang/rails,amoody2108/TechForJustice,mijoharas/rails,gavingmiller/rails,palkan/rails,yalab/rails,maicher/rails,hanystudy/rails,illacceptanything/illacceptanything,88rabbit/newRails,ngpestelos/rails,deraru/rails,mechanicles/rails,assain/rails,pschambacher/rails,Edouard-chin/rails,88rabbit/newRails,sealocal/rails,fabianoleittes/rails,baerjam/rails,kmcphillips/rails,rossta/rails,kddeisz/rails,ttanimichi/rails,kddeisz/rails,yahonda/rails,deraru/rails,notapatch/rails,lcreid/rails,prathamesh-sonpatki/rails,gfvcastro/rails,vassilevsky/rails,bolek/rails,prathamesh-sonpatki/rails,Spin42/rails,vipulnsward/rails,palkan/rails,yalab/rails,utilum/rails,marklocklear/rails,ttanimichi/rails,mijoharas/rails,printercu/rails,Stellenticket/rails,kachick/rails,pschambacher/rails,BlakeWilliams/rails,bogdanvlviv/rails,brchristian/rails,sealocal/rails,mtsmfm/rails,gauravtiwari/rails,fabianoleittes/rails,kamipo/rails,prathamesh-sonpatki/rails,felipecvo/rails,mathieujobin/reduced-rails-for-travis,esparta/rails,Vasfed/rails,illacceptanything/illacceptanything,georgeclaghorn/rails,iainbeeston/rails,mathieujobin/reduced-rails-for-travis,notapatch/rails,gauravtiwari/rails,yahonda/rails,assain/rails,eileencodes/rails,arunagw/rails,rails/rails,bradleypriest/rails,koic/rails,xlymian/rails,tijwelch/rails,kirs/rails-1,shioyama/rails,yhirano55/rails,travisofthenorth/rails,kmcphillips/rails,illacceptanything/illacceptanything,rafaelfranca/omg-rails,yasslab/railsguides.jp,voray/rails,yhirano55/rails,mathieujobin/reduced-rails-for-travis,mtsmfm/railstest,eileencodes/rails,marklocklear/rails,Envek/rails,yawboakye/rails,yhirano55/rails,voray/rails,matrinox/rails,Sen-Zhang/rails,aditya-kapoor/rails,baerjam/rails,bogdanvlviv/rails,eileencodes/rails,esparta/rails,brchristian/rails,BlakeWilliams/rails,arjes/rails,vassilevsky/rails,iainbeeston/rails,printercu/rails,eileencodes/rails,koic/rails,sergey-alekseev/rails,matrinox/rails,coreyward/rails,ngpestelos/rails,joonyou/rails,schuetzm/rails,illacceptanything/illacceptanything,yahonda/rails,kachick/rails,xlymian/rails,kmcphillips/rails,pschambacher/rails,alecspopa/rails,tjschuck/rails,tgxworld/rails,utilum/rails,bogdanvlviv/rails,kaspth/rails,vassilevsky/rails,palkan/rails,kirs/rails-1,rbhitchcock/rails,kaspth/rails,baerjam/rails,rbhitchcock/rails,kirs/rails-1,shioyama/rails,palkan/rails,gavingmiller/rails,ttanimichi/rails,starknx/rails,rafaelfranca/omg-rails,ledestin/rails,BlakeWilliams/rails,illacceptanything/illacceptanything,rails/rails,joonyou/rails,mtsmfm/rails,kenta-s/rails,flanger001/rails,BlakeWilliams/rails,kenta-s/rails,arunagw/rails,deraru/rails,coreyward/rails,esparta/rails,Stellenticket/rails,lcreid/rails,tijwelch/rails,bradleypriest/rails,betesh/rails,kmcphillips/rails,mohitnatoo/rails,Edouard-chin/rails,schuetzm/rails,arunagw/rails,xlymian/rails,yasslab/railsguides.jp,mtsmfm/railstest,yawboakye/rails,ngpestelos/rails,flanger001/rails,starknx/rails,elfassy/rails,esparta/rails,utilum/rails,odedniv/rails,flanger001/rails,tjschuck/rails,voray/rails,Spin42/rails,illacceptanything/illacceptanything,riseshia/railsguides.kr,deraru/rails,MSP-Greg/rails,Envek/rails,betesh/rails,gfvcastro/rails,starknx/rails,aditya-kapoor/rails,iainbeeston/rails,illacceptanything/illacceptanything,schuetzm/rails,riseshia/railsguides.kr,repinel/rails,repinel/rails,arunagw/rails,mijoharas/rails,kenta-s/rails,schuetzm/rails,Vasfed/rails,hanystudy/rails,gcourtemanche/rails,riseshia/railsguides.kr,bradleypriest/rails,maicher/rails,kddeisz/rails,lcreid/rails,travisofthenorth/rails,hanystudy/rails,tgxworld/rails,yasslab/railsguides.jp,travisofthenorth/rails,rails/rails,mohitnatoo/rails,amoody2108/TechForJustice,kddeisz/rails,kamipo/rails,tgxworld/rails,tijwelch/rails,gcourtemanche/rails,illacceptanything/illacceptanything,jeremy/rails,stefanmb/rails,bolek/rails,georgeclaghorn/rails,jeremy/rails,arjes/rails,Stellenticket/rails,odedniv/rails,stefanmb/rails,betesh/rails,utilum/rails,amoody2108/TechForJustice,yasslab/railsguides.jp,marklocklear/rails,illacceptanything/illacceptanything,notapatch/rails,shioyama/rails,matrinox/rails,alecspopa/rails,lucasmazza/rails,jeremy/rails,Erol/rails,richseviora/rails,georgeclaghorn/rails,betesh/rails,notapatch/rails,lucasmazza/rails,maicher/rails,bolek/rails,yawboakye/rails,gauravtiwari/rails,mtsmfm/rails,Edouard-chin/rails,Spin42/rails,mohitnatoo/rails,tjschuck/rails,kmayer/rails,iainbeeston/rails,richseviora/rails,MichaelSp/rails,samphilipd/rails,assain/rails,felipecvo/rails,brchristian/rails,vipulnsward/rails,illacceptanything/illacceptanything,rafaelfranca/omg-rails,gfvcastro/rails,joonyou/rails,rbhitchcock/rails,MSP-Greg/rails,illacceptanything/illacceptanything,bogdanvlviv/rails,felipecvo/rails,rossta/rails,kamipo/rails,kaspth/rails,vipulnsward/rails,elfassy/rails,elfassy/rails,odedniv/rails,illacceptanything/illacceptanything,pvalena/rails,Vasfed/rails,joonyou/rails,shioyama/rails,illacceptanything/illacceptanything,EmmaB/rails-1,untidy-hair/rails,mechanicles/rails,untidy-hair/rails,mtsmfm/railstest,repinel/rails,yhirano55/rails,MichaelSp/rails,alecspopa/rails,rossta/rails,gfvcastro/rails,arjes/rails,sergey-alekseev/rails,MSP-Greg/rails,fabianoleittes/rails,yahonda/rails,richseviora/rails,mohitnatoo/rails,lucasmazza/rails,pvalena/rails,repinel/rails,Envek/rails,baerjam/rails,georgeclaghorn/rails,printercu/rails,aditya-kapoor/rails,Sen-Zhang/rails,ledestin/rails,samphilipd/rails,coreyward/rails,Erol/rails,flanger001/rails,EmmaB/rails-1,prathamesh-sonpatki/rails,tjschuck/rails,Envek/rails,sealocal/rails,Stellenticket/rails,Erol/rails,illacceptanything/illacceptanything,stefanmb/rails,aditya-kapoor/rails,Edouard-chin/rails,assain/rails,travisofthenorth/rails,jeremy/rails,koic/rails,tgxworld/rails,fabianoleittes/rails