Update dependencies

requirements/base.txt

-cryptography==2.0
+cryptography==2.7
 amqp==1.4.7
 anyjson==0.3.3
 arrow==0.7.0
@@ -26,9 +26,9 @@ logutils==0.3.3
 MarkupSafe==0.23
 netaddr==0.7.14
 pip-tools==0.3.6
-psycopg2==2.6
+psycopg2==2.7.7
 Pygments==2.0.2
-pylibmc==1.4.3
+pylibmc==1.6.0
 python-dateutil==2.4.2
 pyinotify==0.9.5
 pyotp==2.1.1

requirements/production.txt

 # Pro-tip: Try not to put anything here. There should be no dependency in
 # production that isn't in development.
 -r base.txt
-uWSGI==2.0.13.1
+uWSGI==2.0.18