Add coverage and coveralls back to tox and travis.

ci/run_coveralls.py

@@ -0,0 +1,15 @@
+#!/bin/env/python
+
+"""Runs coveralls if in Travis CI build environment. Taken from
+http://stackoverflow.com/a/33012308/1960601
+"""
+
+import os
+
+from subprocess import call
+
+
+if __name__ == '__main__':
+    if 'TRAVIS' in os.environ:
+        rc = call('coveralls')
+        raise SystemExit(rc)