Added max_paginate_by parameter
fix for python3
Merge branch 'max_paginate_by' of git://github.com/alexander-akhmetov/django-rest-framework into alexander-akhmetov-max_paginate_by
Tweak MAX_PAGINATE_BY behavior in edge case.

Always respect `paginate_by` settings if client does not specify page
size.  (Even if the developer has misconfigured, so that `paginate_by >
max`.)
Docs for `MAX_PAGINATE_BY` setting & view attribute.
Added @alexander-akhmetov.

For work on MAX_PAGINATE_BY, #1063.  Thanks! :)