Update links in changelog to link to github.com/refinery.
Update links in changelog to link to github.com/refinery.

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