[BUGFIX beta] Move `jQuery.ajax` call to a method separate method
[BUGFIX beta] Move `jQuery.ajax` call to a method separate method

Allow for overriding of the `ajax` request by overriding
`RESTAdapter.ajaxRequest` instead of the `RESTAdapter.ajax`, which
perform promise wrapping and Ember Data specific errors

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