investigate why coveralls isn't working

[jairideout]

travis output for running coveralls:

$ coveralls
Submitting coverage to coveralls.io...
Traceback (most recent call last):
  File "/home/travis/virtualenv/python2.7.8/bin/coveralls", line 9, in <module>
    load_entry_point('coveralls==0.5', 'console_scripts', 'coveralls')()
  File "/home/travis/virtualenv/python2.7.8/lib/python2.7/site-packages/coveralls/cli.py", line 60, in main
    result = coverallz.wear()
  File "/home/travis/virtualenv/python2.7.8/lib/python2.7/site-packages/coveralls/api.py", line 78, in wear
    json_string = self.create_report()
  File "/home/travis/virtualenv/python2.7.8/lib/python2.7/site-packages/coveralls/api.py", line 97, in create_report
    data = self.create_data()
  File "/home/travis/virtualenv/python2.7.8/lib/python2.7/site-packages/coveralls/api.py", line 146, in create_data
    self._data.update(self.git_info())
  File "/home/travis/virtualenv/python2.7.8/lib/python2.7/site-packages/coveralls/api.py", line 180, in git_info
    rev = run_command('git', 'rev-parse', '--abbrev-ref', 'HEAD').strip()
  File "/home/travis/virtualenv/python2.7.8/lib/python2.7/site-packages/coveralls/api.py", line 222, in run_command
    assert cmd.returncode == 0
AssertionError