Manypex

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* Add first-class support for multi-interpreter and multi-platform pex construction. (394)
`394 <https://github.com/pantsbuild/pex/pull/394>`_

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* Minimum setuptools version should be 20.3 (391)
`391 <https://github.com/pantsbuild/pex/pull/391>`_

* Improve wheel support in pex. (388)
`388 <https://github.com/pantsbuild/pex/pull/388>`_

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* Sort keys in PEX-INFO file so the output is deterministic. (384)
`384 <https://github.com/pantsbuild/pex/pull/384>`_

* Pass platform for SourceTranslator (386)
`386 <https://github.com/pantsbuild/pex/pull/386>`_

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* Fix for Ambiguous Resolvable bug in transitive dependency resolution (367)
`367 <https://github.com/pantsbuild/pex/pull/367>`_

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This release follows-up on 1.2.0 fixing bugs in the pre-release resolving code paths.

* Resolving pre-release when explicitly requested (372)
`374 <https://github.com/pantsbuild/pex/pull/374>`_

* Pass allow_prerelease to other iterators (Static, Caching) (373)
`373 <https://github.com/pantsbuild/pex/pull/373>`_

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* Fix bug in cached dependency resolution with exact resolvable. (365)
`365 <https://github.com/pantsbuild/pex/pull/365>`_

* Treat .pth injected paths as extras. (370)
`370 <https://github.com/pantsbuild/pex/pull/370>`_