Add python*-config approach to ldflags that works for OS X.
Merge pull request #186 from scottpurdy/python-config

Add python*-config approach to ldflags that works for OS X.
Use `python${PYTHON_VERSION}-config` approach for all platforms
Merge pull request #188 from oxtopus/python-version-fixed

Use `python${PYTHON_VERSION}-config` approach for all platforms
Removing triple verbosity flag from pip to reduce travis console output
Merge remote-tracking branch 'upstream/master' into NPC-323-less_verbose_pip
Merge pull request #189 from oxtopus/NPC-323-less_verbose_pip

Removing triple verbosity flag from pip to reduce travis console output
Merge remote-tracking branch 'upstream/master' into publish-artifacts