Fix "defaultContainer is no longer supported" deprecation warning
Fix "defaultContainer is no longer supported" deprecation warning

The fix is based on https://gist.github.com/stefanpenner/5627411 and modelled after similar fix to ember-table: https://github.com/addepar/ember-table/commit/1fd29fdb2ae5283a7664f83789cc6b3550a5eb3c
krisselden/list-view,shaunc/ember-collection,alexdiliberto/ember-collection,flexyford/ember-collection,BryanCrotaz/ember-collection,arenoir/ember-collection,code0100fun/ember-collection,usecanvas/list-view,draios/list-view,usecanvas/list-view,srgpqt/ember-collection,krisselden/list-view,emberjs/ember-collection,greyhwndz/ember-collection,shamim8888/list-view,alexdiliberto/list-view,lukemelia/list-view,alexdiliberto/list-view,greyhwndz/ember-collection,draios/list-view,lukemelia/list-view,emberjs/list-view,aldhsu/ember-collection,code0100fun/ember-collection,paddyobrien/ember-collection,mmun/ember-collection,mrinterweb/ember-collection,aldhsu/ember-collection,igorrKurr/list-view,srgpqt/ember-collection,jeff3dx/list-view,mmun/ember-collection,draios/list-view,lukemelia/ember-collection,arenoir/ember-collection,jeff3dx/list-view,mrinterweb/ember-collection,BryanCrotaz/ember-collection,nkgm/ember-collection,shamim8888/list-view,igorrKurr/list-view,emberjs/list-view,paddyobrien/ember-collection,shaunc/ember-collection,flexyford/ember-collection,alexdiliberto/ember-collection,emberjs/ember-collection,lukemelia/ember-collection,nkgm/ember-collection