roll a release with Fabric and gitflow

def roll_release(version):
    local('git flow release start %s' % (version,), capture=True)
    local('sed -e "s/\'AWS_PREFIX\':.*$/\'AWS_PREFIX\': \'%s\', # cache bust/g" -i \'\' potluck/settings/base.py' % (version,))
    local('git commit -am \'Bumped media version to %s\'' % (version,))
    local('git flow release finish -m %s -p %s' % (version, version), capture=True)