Pex

This release adds support for including sources and resources directly
in a produced pex - without the need to use pants.

* Add resource / source bundling to pex cli (507)

Another bugfix release for the 1.4.x series.

* Repair environmental marker platform setting. (500)
* Broaden abi selection for non-specified abi types. (503)

This release repairs a tag matching regression for .egg dists that
inadvertently went out in 1.4.1.

* Improve tag generation for EggPackage. (493)

A bugfix release for 1.4.x.

* Repair abi prefixing for PyPy. (483)
* Repair .egg resolution for platform specific eggs. (486)
* Eliminate the python3.3 shard. (488)

This release includes full Manylinux support, improvements to wheel
resolution (including first class platform/abi tag targeting) and a
handful of other improvements and bugfixes. Enjoy!

Special thanks to Dan Blanchard (dan-blanchard) for seeding the
initial PR for Manylinux support and wheel resolution improvements.

* Complete manylinux support in pex. (480)
* Add manylinux wheel support and fix a few bugs along the way (316)
* Skip failing tests on pypy shard. (478)
* Bump travis image to Trusty. (476)
* Mock PATH for problematic interpreter selection test in CI (474)
* Skip two failing integration tests. (472)
* Better error handling for missing setuptools. (471)
* Add tracebacks to IntegResults. (469)
* Fix failing tests in master (466)
* Repair isort-check failure in master. (465)
* Repair style issues in master. (464)
* Fixup PATH handling in travis.yml. (462)

* Add blacklist handling for skipping requirements in pex resolver
(457)