Ignore coverage results

coverage.py creates HTML reports in the htmlcov directory (this tool can also be used with coveralls.io)
http://nedbatchelder.com/code/coverage/
https://pypi.python.org/pypi/coverage

Python.gitignore

@@ -27,6 +27,7 @@ pip-log.txt
 pip-delete-this-directory.txt
 
 # Unit test / coverage reports
+htmlcov/
 .tox/
 .coverage
 .cache