Vagrantpy

or higher.

- Use `--machine-readable` output for `status`, `box_list`, and `plugin_list`.
- Allow arbitrary status codes, so new statuses do not break parsing.
Previously, statuses were constrained to known ones for the sake of parsing.
Now that machine-readable vagrant output is being used, any status can be
parsed.
- Status value constants (e.g. vagrant.Vagrant.NOT_CREATED) have changed to
match the "state" value returned by the `--machine-readable` output of
the `vagrant status` command.
- The box version is now returned for a box listing

- Pull Request 54: Create ssh() method to run shell commands in a VM
Authors: Parker Thompson (https://github.com/mothran) and Todd DeLuca
(https://github.com/todddeluca)
- Pull Request 56: Return generator for `up` and `reload` output lines to
avoid having entire output in memory.
Authors: mmabey (https://github.com/mmabey) and Todd DeLuca
(https://github.com/todddeluca)

- Pull Request 51: Add support for the vagrant package command.
Author: Hans-Christoph Steiner (https://github.com/eighthave)

- Pull Request 50: Filter out unneeded status lines for AWS instances
Author: Brian Berry (https://github.com/bryanwb)

- Pull Request 47: Add support for snapshot command (vagrant version >= 1.8.0)
Author: Renat Zaripov (https://github.com/rrzaripov)

- Pull Request 46: Adds support for Vagrant 1.8 `--machine-readable` changes.
See https://github.com/todddeluca/python-vagrant/pull/46.
Author: Conor (https://github.com/conorsch)