Calmjs.rjs

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- Update the export_target production and usage of working_dir to be
inline with what is expected by ``calmjs-3.1.0``. [
`3 <https://github.com/calmjs/calmjs.rjs/issues/3>`_
]

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- Support for ``calmjs-3.0.0`` features and breaking changes.
- Loader plugin framework migrated upstream; downstream packages that
make use of them should no longer declare explicit entries in
``extras_calmjs`` to permit wider portability.
- Removed usage of ``slimit`` in favor of the capabilities now provided
by ``calmjs`` and ``calmjs.parse``.
- The flags for the ``calmjs rjs`` runtime have been changed to remove
some naming confusion, mainly due to sourcemap and also to maintain
consistency with other ``calmjs`` tools.

- ``--bundle-map-method`` is deprecated in favor for
``--bundlepath-method``; will be fully removed by 3.0.0
- ``--source-map-method`` is deprecated in favor for
``--sourcepath-method``; will be fully removed by 3.0.0

- Provide a generic package-level artifact builder for the
``calmjs.artifacts`` registry along with the respective tester for the
``calmjs.artifacts.tests`` registry.

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- Corrected the issue where plugins that have been unmapped using the
``empty:`` scheme triggering ``FileNotFoundError``.

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- Load the non-test files in deps also, instead as part of the tests to
avoid automatic inclusion.
- Test files should start with the name test as per convention.

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- Initial implementation that brings in the support of the production of
AMD artifacts (bundles) from JavaScript sources included with Python
packages (along with their declared dependencies through ``npm`` or
other supported tools) through the calmjs framework.
- Enabled the ``calmjs rjs`` tool entry point.
- Also provide integration with ``calmjs.dev`` by correcting the correct
hooks so that this package can be used as an advice package for the
execution of tests against artifacts generated through this package.