chore(controller): update to Django 1.6.3 security release

Details at https://www.djangoproject.com/weblog/2014/apr/21/security/
fix(contrib/ec2): fix ephemeral port range

The default ephemeral port range is set to 49152 according to
http://www.ncftp.com/ncftpd/doc/misc/ephemeral_ports.html. Some
apps that start on 49153 will be blocked by the firewall otherwise.
fix(coverage): cd to controller dir before submitting to coveralls.io

closes #818.
Merge pull request #827 from deis/fix-ephemeral-port-range

fix(contrib/ec2): fix ephemeral port range
Merge pull request #828 from deis/fix-coveralls-io

fix(coverage): cd to controller dir before submitting to coveralls.io
Merge pull request #794 from deis/django-1.6.3

chore(controller): update to Django 1.6.3 security release
fix(Makefile): use /bin/sh if syntax
Merge pull request #829 from deis/make-controller

fix(Makefile): use /bin/sh if syntax
fix(builder): update Docker to v0.10.0

Fixes #712.