Jaraco.fabric

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Added Python module.

Dropped support for Python 3.5 and earlier.

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Added more tasks for supporting MongoDB deployment:

- enable_authentication
- install_user
- bind_all

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* 3: Fix version handling for both repo selection and
package installation on MongoDB. Set default version
to 3.2. Now one can simply install the major release
as so:

python -m jaraco.fabric mongodb.distro_install:3.2

Or install the default version with no version at all:

python -m jaraco.fabric mongodb.distro_install

* 4: Install the systemd configuration so that the
service is managed.

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Prefer ``apt`` to ``aptitude``.

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Allow package to be executed with ``-m jaraco.fabric``,
creating a fabfile and running Fabric against it.

Package is automatically deployed via continuous
integration when tests pass on Python 3.

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Move hosting to Github.