Toolrack

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- Add ``toolrack.log`` module.

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- Require Python 3.5 for new asyncio async/await syntax.
- Update code to use ``async``/``await``.
- ``LoopTestCase`` now requires async test methods to be declared as such.
- Add ``clear()`` and ``len()`` support to Collection.
- Add overridable ``Script.handle_keyboard_interrupt`` handler.
- Use relative imports in library code.

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- Added modules:
- ``toolrack.async``
- ``toolrack.property``
- ``toolrack.testing.async``

- Moved ``TempDirFixture`` to the ``toolrack.testing.fixtures`` module.
- Added ``password-generator`` script.

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- Add ``toolrack.threading module``.

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- Add ``TempDirFixture.join``.

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- Finalize switch to python3.
- Code cleanups.