Added the ``use_in`` argument to fields so you can exclude certain fields when retriving a list
of resources vs a single resource.

* Applied patch described in https://github.com/toastdriven/django-tastypie/issues/526.
* Added the ability to make the ``use_in`` argument a callable
* Made ``use_in`` argument available to related fields
* Added the appropriate authors. Thanks to @funkybob for the original patch and @numan for the PR, enhancements, and tests.