Pip-compile-multi

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* Fixed MANIFEST to include features directory

Warning: this version is broken and won't pass ``--upgrade`` option to ``pip-compile``.
See notes for 1.5.6_ for details.

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* Refactored features to separate modules.
* Allow passing verify options after verify command.
* Trim irrelevant entries from the traceback.

Warning: this version is broken and won't install ``features`` directory.
See notes for 1.5.6_ for details.

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* Added option ``--allow-unsafe``. (thanks to mozbhearsum 157).

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* Added option ``--use-cache``. (thanks to kolotev 149).

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* Changed short option for ``--forbid-post`` from ``-P`` to ``-p``
(as it conflicted with ``-P`` for ``--upgrade-package`` 147).

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* Re-removed workaround for future[s] packages in Python3