Removed some unnecessary queries made during each AJAX call when a user changes their usage status for a package.
Removed some unnecessary queries made during each AJAX call when a user changes their usage status for a package.

audreyr/opencomparison,benracine/opencomparison,cartwheelweb/packaginator,QLGu/djangopackages,benracine/opencomparison,pydanny/djangopackages,miketheman/opencomparison,QLGu/djangopackages,nanuxbe/djangopackages,miketheman/opencomparison,QLGu/djangopackages,pydanny/djangopackages,cartwheelweb/packaginator,nanuxbe/djangopackages,audreyr/opencomparison,pydanny/djangopackages,cartwheelweb/packaginator,nanuxbe/djangopackages