Codecov Integration

[opalmer]

codecov.io is a service which provides an easy way to view coverage results. While we already use coveralls.io there's a few things which codecov.io offers that can improve on our experience with code coverage:

• It works on Windows, Mac and Linux.
• It easily integrates with both Travis and AppVeyor.
• Coverage reports are commit dependent rather than build dependent.
• Codecov will make one comment in a review and update it rather than making several.
• The results are shown faster and the interface is cleaner.

[codecov-io]

Current coverage is 72.41%

Branch #354 has no coverage reports uploaded yet.

No diff could be generated. No reports for master found.
Review entire Coverage Diff as of a4cdfa6

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[opalmer]

@guidow, PTAL. I've been using this on another project, pywincffi, for a while and overall it's a much better service.