Cancel request loading

[fcaraujo]

Hi, at first, great job! Is there intention to support cancel request like resource in 1.5.x?

Ref. $cancelRequest:

• https://code.angularjs.org/1.5.0/docs/api/ngResource/service/$resource
• https://stackoverflow.com/questions/35066781/angularjs-cancelrequest-not-available-in-resource

Thx