Fix the preloader API which changed in Rails 4.1
Fix the preloader API which changed in Rails 4.1

gwagener/refinerycms,simi/refinerycms,anitagraham/refinerycms,mkaplan9/refinerycms,chrise86/refinerycms,mabras/refinerycms,KingLemuel/refinerycms,mkaplan9/refinerycms,hoopla-software/refinerycms,mabras/refinerycms,gwagener/refinerycms,trevornez/refinerycms,aguzubiaga/refinerycms,Retimont/refinerycms,mkaplan9/refinerycms,hoopla-software/refinerycms,aguzubiaga/refinerycms,trevornez/refinerycms,hoopla-software/refinerycms,chrise86/refinerycms,stefanspicer/refinerycms,gwagener/refinerycms,refinery/refinerycms,mabras/refinerycms,LytayTOUCH/refinerycms,LytayTOUCH/refinerycms,kappiah/refinerycms,LytayTOUCH/refinerycms,Eric-Guo/refinerycms,KingLemuel/refinerycms,sideci-sample/sideci-sample-refinerycms,anitagraham/refinerycms,mlinfoot/refinerycms,trevornez/refinerycms,Eric-Guo/refinerycms,johanb/refinerycms,mlinfoot/refinerycms,Retimont/refinerycms,bricesanchez/refinerycms,kappiah/refinerycms,refinery/refinerycms,simi/refinerycms,sideci-sample/sideci-sample-refinerycms,johanb/refinerycms,Eric-Guo/refinerycms,simi/refinerycms,johanb/refinerycms,anitagraham/refinerycms,mlinfoot/refinerycms,bricesanchez/refinerycms,KingLemuel/refinerycms,chrise86/refinerycms,refinery/refinerycms,simi/refinerycms,aguzubiaga/refinerycms,stefanspicer/refinerycms,stefanspicer/refinerycms,Retimont/refinerycms,kappiah/refinerycms