pex 1.4.0

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1.4.0

• 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)