Fuselage

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- ``If File.contents`` is ``None`` then fuselage will ensure the file exists
with the correct permissions but won't empty it. To empty a file set contents
to ``''``.

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- We now test file creation and removal on our Windows builders.

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- Fix the runner on py3. json.loads won't accept bytes.

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- The tests are now run on Windows via AppVeyor.

- Better handling of PolicyArguments (mitchellrj).

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- The state directory (which is used to make sure that interupted tasks can be
safely resumed) is now configurable. This means it is now safe to run
multiple fuselage deployments in parallel (where it makes sense to do so).
It's now also possible to run fuselage as a normal user (mitchellrj).

- The fuselage runner can be told to not raise an exception if no changes were
made (mitchellrj).

- Shell commands can now be told to ignore failure cases (mitchellrj).

- Further python 3 support fixes (mitchellrj).

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- Embed ``File.source`` assets in fuselage bundles properly (instead of
including them in the JSON payload).

- For SVN, always run EnsureDirectory to ensure can checkout to directory. Only
svn co if no .svn directory. This will fail if directory isnt empty.

- Various python 3 fixes (thanks mitchellrj)

- Various OSX fixes.