Scripttest

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* Fixed regression with ``FoundDir.invalid``

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* Windows fix for cleaning up scratch files more reliably

* Allow spaces in the ``script`` name, e.g., ``C:/program
files/some-script`` (but you must use multiple arguments to
``env.run(script, more_args)``).

* Remove the resolution of scripts to an absolute path (just allow the
OS to do this).

* Don't fail if there is an invalid symlink

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* ``env.run()`` now takes a keyword argument ``quiet``. If quiet is
false, then if there is any error (return code != 0, or stderr
output) the complete output of the script will be printed.

* ScriptTest puts a marker file in scratch directories it deletes, so
that if you point it at a directory not created by ScriptTest it
will raise an error. Without this, unwitting developers could point
ScriptTest at the project directory, which would cause the entire
project directory to be wiped.

* ProcResults now no longer print the absolute path of the script
(which is often system dependent, and so not good for doctests).

* Added :func:`scripttest.ProcResults.wildcard_matches` which returns file
objects based on a wildcard expression.

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Initial release