Support for automatic paging

[jameskirsop]

It would be helpful for this implementation to support the automation of returning the results from all the available pages in a request. I see this as a boolean flag which specifies if you want to get all the results in a single call, or handle this yourself (with the default being the latter - for performance reasons). There are instances where I need to grab all the objects in a list of results, not just the first x results.

I could write this myself for each request I make, or subclass the client, but having this built in by a (named) argument passed to the .get() function would be preferable to keep to DRY principals.

Implementation wise it would require a loop checking for the @odata.nextLink key in the returned JSON dictionary for each fetch, and returning all the results when this key is no longer present in the response.