Add support for OData $batch support in Office 365

[andrewconnell]

In late 2014 Microsoft added support for the OData $batch operator. Currently the SharePoint data service adapter forces individual requests. It should add support for it. This will only work in Office 365 today, not on-premises SharePoint 2013 deployments.

Ref: http://www.andrewconnell.com/blog/part-1-sharepoint-rest-api-batching-understanding-batching-requests