Tangled.session

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- No changes yet

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- Upgraded `tangled` 0.1a5 => 0.1a9.
- Upgraded `Beaker` 1.6.4 => 1.8.1
- Replaced `reify` with `cached_property` throughout.

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- Add tangled to packages list in setup()

- Require released version of tangled 0.1a5 or newer

- Update trove classifiers

- Declare package to be Alpha status
- Declare support for Python 3.3 and 3.4 specifically (instead of generic
Python 3)

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First release