Wdl-aid

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- Added setuptools as a dependency. In some environments setuptools may
not be installed by default. This package uses it for its core
functionality, so it was added as an explicit requirment.

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- Strict mode can now be set for inputs and outputs separatly using the
``--strict-inputs`` and ``--strict-outputs`` flags respectively.
``--strict`` sets both to true.
- Input categories are now presented to jinja2 under the ``inputs`` variable,
rather than as top-level variables themselves.
- The default template will now include the outputs. The outputs' categories
are ignored by the default template.
- Documenting outputs is now supported. Information regarding the outputs
will be presented to jinja2 under the ``outputs`` variable in a similar
structure as the inputs, but without the ``default`` field.
- Miniwdl no longer needs to be specifically version 0.5. Version 1.0 or
higher is now expected.
- The error shown when there is no workflow in the given WDL file is now
clearer.

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- Inputs without a default will now be given a ``None`` value in the default
field passed to jinja2, instead of a string containing ``None``.
This should not impact generated documents (unless specific logic dealing
with ``None`` values is used), as jinja will still render ``None`` values as
``None``.

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- initial release