Backport Travis configuration

[brettcannon]

BPO	29529
Nosy	@brettcannon, @ncoghlan, @methane
PRs	[backport to 3.6] bpo-29529: Add .travis.yml to 3.6 branch #25 [backport to 3.5] bpo-29529: Add .travis.yml to 3.5 branch #26 [backport to 2.7] bpo-29529: Add .travis.yml to 2.7 branch #27
Dependencies	bpo-29528: Encrypt IRC channel details for Travis

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/brettcannon'
closed_at = <Date 2017-02-20.10:21:23.393>
created_at = <Date 2017-02-10.23:59:00.442>
labels = []
title = 'Backport Travis configuration'
updated_at = <Date 2017-02-20.10:21:23.392>
user = 'https://github.com/brettcannon'

bugs.python.org fields:

activity = <Date 2017-02-20.10:21:23.392>
actor = 'methane'
assignee = 'brett.cannon'
closed = True
closed_date = <Date 2017-02-20.10:21:23.393>
closer = 'methane'
components = []
creation = <Date 2017-02-10.23:59:00.442>
creator = 'brett.cannon'
dependencies = ['29528']
files = []
hgrepos = []
issue_num = 29529
keywords = []
message_count = 5.0
messages = ['287576', '287627', '288104', '288106', '288173']
nosy_count = 3.0
nosy_names = ['brett.cannon', 'ncoghlan', 'methane']
pr_nums = ['25', '26', '27']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue29529'
versions = ['Python 2.7', 'Python 3.5', 'Python 3.6']

[brettcannon]

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

[brettcannon]

python/core-workflow#19 should be decided upon before backporting anything.

[ncoghlan]

New changeset 3337d33 by Nick Coghlan in branch '3.6':
[backport to 3.6] bpo-29529: Add .travis.yml to 3.6 branch (#25)
3337d33

[ncoghlan]

New changeset 24bfe15 by Nick Coghlan in branch '3.5':
[backport to 3.5] bpo-29529: Add .travis.yml to 3.5 branch (#26)
24bfe15

[methane]

New changeset 98604c7 by GitHub in branch '2.7':
bpo-29529: Add .travis.yml to 2.7 branch (GH-27)
98604c7