Require rack-cache 1.1.
Require rack-cache 1.1.

Versions prior to 1.1 delete the If-Modified-Since and If-Not-Modified headers when
config.action_controller.perform_caching is true. This has two problems:
 * unexpected inconsistent behaviour between development & production environments
 * breaks applications that use of these headers

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