Add release notes for Ember Data 2.4.1
Add release notes for Ember Data 2.4.1

ryanpatrickcook/data,nickiaconis/data,danmcclain/data,danmcclain/data,swarmbox/data,danmcclain/data,swarmbox/data,wecc/data,courajs/data,courajs/data,tarzan/data,tarzan/data,arenoir/data,arenoir/data,workmanw/data,courajs/data,rtablada/data,tarzan/data,tarzan/data,HeroicEric/data,ryanpatrickcook/data,swarmbox/data,nickiaconis/data,davidpett/data,nickiaconis/data,danmcclain/data,courajs/data,davidpett/data,workmanw/data,HeroicEric/data,arenoir/data,wecc/data,davidpett/data,arenoir/data,rtablada/data,ryanpatrickcook/data,HeroicEric/data,workmanw/data,ryanpatrickcook/data,rtablada/data,rtablada/data,wecc/data,HeroicEric/data,nickiaconis/data,swarmbox/data,davidpett/data,workmanw/data,wecc/data