Varnish-bans-manager

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- Minor changes.

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- Upgrade to Django 1.7.
- Upgraded other requirements to their latest version.
- Fixed example init.d scripts for production environments.

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- Improved/updated infrastructure (setup.py, Puppet manifest, etc.).
- Blocked django-celery package version (3.0.23).

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- Updated Django dependency in setup.py in order to keep using 1.5.*.

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- Removed ALLOWED_HOSTS filtering.

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- Upgrade to Django 1.5.
- Improved Vagrant env.
- Minor bugfixes.