[issue29529] Backport Travis configuration

[Brett Cannon]

New submission from Brett Cannon:

Once the Travis config stabilizes then it should be backported to all active branches.

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assignee: brett.cannon
messages: 287576
nosy: brett.cannon
priority: normal
severity: normal
status: open
title: Backport Travis configuration
versions: Python 2.7, Python 3.5, Python 3.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29529>
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