Commandant

Improvements

- Commandant has a new home at: https://github.com/jkakar/commandant
- The README has been updated and includes instructions on setting up
a Virtualenv-based environment.

Improvements

- A new `commandant.testing` package has been added and the `mocker`
and resources `modules` have been moved to it. Also, a new
`StdoutResource` has been to the resources module to handle mocking
`sys.stdout`.
- A new `TwistedCommand` base class can be used to write command that
need to run in a Twisted reactor. If they return a `Deferred` the
reactor will run until it fires and callbacks have been invoked.

Improvements

- The `CommandController` is now composed of four mixin classes that
can be combined and tweaked to create custom controllers.
- `CommandController` takes optional parameters: program name, program
version, program summary and program URL. When provided, they are
used in output generated by the `version` and `help` commands.
- The `version` command takes an optional `--short` command-line
option that, when provided, causes it to output just the version
number.
- The `version` command includes information about Python, `bzrlib`
and `commandant` modules in its output, in addition to information
about the program being run.
- A new `DocstringHelpTopic` can be subclassed to create topics that
load summary and help content from the subclass's docstring.
- New `BzrlibHooksResource` test resource resets internal data
structures in `bzrlib` that may have been modified by tests.
- `bzrlib`'s internal UI machinery is initialized before `bzrlib`
hooks are installed.

Bug fixes

- If the first option, expected to be the command path, starts with a
`-` a usage message is shown, instead of an error about a missing
path.