Remove unused `shims` file.
Remove unused `shims` file.

These shims are already provided by `lib/ember-data-shims.js`.

rtablada/data,jgwhite/data,HeroicEric/data,davidpett/data,topaxi/data,arenoir/data,jgwhite/data,swarmbox/data,nickiaconis/data,davidpett/data,jgwhite/data,wecc/data,workmanw/data,tarzan/data,eriktrom/data,nickiaconis/data,nickiaconis/data,swarmbox/data,swarmbox/data,topaxi/data,Eric-Guo/data,jgwhite/data,danmcclain/data,eriktrom/data,arenoir/data,wecc/data,courajs/data,danmcclain/data,Turbo87/ember-data,ryanpatrickcook/data,HeroicEric/data,tarzan/data,rtablada/data,HeroicEric/data,swarmbox/data,ryanpatrickcook/data,Turbo87/ember-data,courajs/data,wecc/data,workmanw/data,arenoir/data,topaxi/data,arenoir/data,workmanw/data,Turbo87/ember-data,danmcclain/data,vikram7/data,Eric-Guo/data,Turbo87/ember-data,davidpett/data,rtablada/data,vikram7/data,Eric-Guo/data,tarzan/data,ryanpatrickcook/data,workmanw/data,eriktrom/data,eriktrom/data,topaxi/data,nickiaconis/data,vikram7/data,rtablada/data,danmcclain/data,ryanpatrickcook/data,Eric-Guo/data,HeroicEric/data,courajs/data,davidpett/data,courajs/data,tarzan/data,wecc/data,vikram7/data