[MRG] MNT Workaround to run tests for numpy 1.8.2 and scipy 0.13.3 in Travis CI #12042
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Closes #12041
Fixes the Python 2.7 Travis CI by using an older pytest version that fails to detect that,
raises a DeprecationWarning with numpy 1.8.2 and scipy 0.13.3 (our oldest supported versions), which would have made the test suite fail with the current pytest settings.
Will open a separate issue about this.