Tests are failing on Travis - here for documentation purposes

[johnathanvidu]

Issue details

18 tests are currently failing on travis.
Most errors looks like that:

SSLError: HTTPSConnectionPool(host='api.github.com', port=443): Max retries exceeded with url: /repos/quali/resource-test/zipball (Caused by SSLError(SSLError("bad handshake: SysCallError(32, 'EPIPE')",),))

If you encounter this error on travis, scroll down to the Explanation section and investigate

Steps to reproduce

Run travis build and verify that it installs coveralls 1.2.0 (travis.yml configured to install the latest coveralls which is currently 1.2.0)

Explanation

On the 16th August 2017 coveralls released a new version (1.2.0) and thus travis installs the latest version. coveralls has a dependency on urllib3 (through requests) but the new version actually requests the secure version (urllib3[secure]) which installs pyopenssl with it (added in 1.11).
For unknown reasons httpretty doesn't work correctly when pyopenssl is installed (I believe it should but it's probably a versions issues), and so our tests fail. I think this is related

The solution is to pinpoint coveralls to version 1.1, and hope that no other dependency will require pyopenssl or that httpretty will fix the problem.