[#570] Upgrade most libraries in requirements/2_rsr.txt
[#570] Upgrade most libraries in requirements/2_rsr.txt

As part of our work on upgrading to Django 1.7 we should use the most
modern version of our library dependencies possible. This commit
upgrades most of the deps in 2_rsr.txt.

akvo/akvo-rsr,akvo/akvo-rsr,akvo/akvo-rsr,akvo/akvo-rsr