Automation

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- Use script from Makefile for quick updates

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- BACKWARDS INCOMPATIBLE: Relay on user-provided Makefile command instead of hardcoding the installation process.
- Bump Fabric version to 1.7.0

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- Rename Python interpreter configuration to `python_interpreter`
- Add verbosity to pip installs

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- Allow user to configure Python version for virtualenv

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- Fixed bug where automation tried to sync with rackspace on fast deploys
even when django-rax is not installed.

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- Pull latest changes to production branch before creating a new topic branch