Add a mixin for helping with queries in API resources.
Review Request #7500 — Created July 8, 2015 and submitted — Latest diff uploaded
This brings over a numeric range query helper from Review Board into
Djblets, as part of a newAPIQueryUtilsMixin. Resources can mix this in
to help keep queries from the user consistent and simple.
Unit tests pass on Djblets and Review Board (with the modification to use this).
Built the docs and verified them.