use rbconfig in engine's generated Gemfile instead of deprecated Config
use rbconfig in engine's generated Gemfile instead of deprecated Config

mkaplan9/refinerycms,stefanspicer/refinerycms,kappiah/refinerycms,KingLemuel/refinerycms,kelkoo-services/refinerycms,gwagener/refinerycms,hoopla-software/refinerycms,johanb/refinerycms,Retimont/refinerycms,trevornez/refinerycms,simi/refinerycms,simi/refinerycms,LytayTOUCH/refinerycms,chrise86/refinerycms,stefanspicer/refinerycms,chrise86/refinerycms,hoopla-software/refinerycms,kappiah/refinerycms,pcantrell/refinerycms,Retimont/refinerycms,chrise86/refinerycms,louim/refinerycms,Eric-Guo/refinerycms,mojarra/myrefinerycms,Eric-Guo/refinerycms,gwagener/refinerycms,SmartMedia/refinerycms-with-custom-icons,trevornez/refinerycms,simi/refinerycms,mojarra/myrefinerycms,louim/refinerycms,anitagraham/refinerycms,sideci-sample/sideci-sample-refinerycms,sideci-sample/sideci-sample-refinerycms,aguzubiaga/refinerycms,SmartMedia/refinerycms-with-custom-icons,anitagraham/refinerycms,mabras/refinerycms,bricesanchez/refinerycms,Retimont/refinerycms,aguzubiaga/refinerycms,gwagener/refinerycms,mabras/refinerycms,johanb/refinerycms,bryanmtl/g-refinerycms,anitagraham/refinerycms,Eric-Guo/refinerycms,mlinfoot/refinerycms,trevornez/refinerycms,aguzubiaga/refinerycms,kelkoo-services/refinerycms,mlinfoot/refinerycms,refinery/refinerycms,KingLemuel/refinerycms,bryanmtl/g-refinerycms,mobilityhouse/refinerycms,pcantrell/refinerycms,hoopla-software/refinerycms,johanb/refinerycms,stefanspicer/refinerycms,refinery/refinerycms,mkaplan9/refinerycms,KingLemuel/refinerycms,mabras/refinerycms,mobilityhouse/refinerycms,LytayTOUCH/refinerycms,mkaplan9/refinerycms,refinery/refinerycms,kappiah/refinerycms,mlinfoot/refinerycms,bricesanchez/refinerycms,LytayTOUCH/refinerycms,simi/refinerycms