TypeError: b'coveralls' is not JSON serializable

[josephharrington]

Full stack trace is below. It looks like the recent change to add Windows support may have missed a universal_newlines=True parameter in the check_output call to get a git branch name.

I'm not sure why this wouldn't be caught on TravisCI. The tests fail for me locally with this error on both OS X and Linux, in Python 3.3.2 and 3.3.6.

$ coveralls --coveralls_url=https://10.228.98.37
Traceback (most recent call last):
  File "/Users/jharrington/.pyenv/versions/rosie-hooks/bin/coveralls", line 11, in <module>
    sys.exit(wear())
  File "/Users/jharrington/.pyenv/versions/3.3.2/envs/rosie-hooks/lib/python3.3/site-packages/coveralls/__init__.py", line 95, in wear
    parallel=args.parallel,
  File "/Users/jharrington/.pyenv/versions/3.3.2/envs/rosie-hooks/lib/python3.3/site-packages/coveralls/api.py", line 7, in post
    json_file = build_file(repo_token, service_job_id, service_name, git, source_files, parallel)
  File "/Users/jharrington/.pyenv/versions/3.3.2/envs/rosie-hooks/lib/python3.3/site-packages/coveralls/api.py", line 22, in build_file
    return StringIO(json.dumps(content))
  File "/Users/jharrington/.pyenv/versions/3.3.2/lib/python3.3/json/__init__.py", line 236, in dumps
    return _default_encoder.encode(obj)
  File "/Users/jharrington/.pyenv/versions/3.3.2/lib/python3.3/json/encoder.py", line 191, in encode
    chunks = self.iterencode(o, _one_shot=True)
  File "/Users/jharrington/.pyenv/versions/3.3.2/lib/python3.3/json/encoder.py", line 249, in iterencode
    return _iterencode(o, 0)
  File "/Users/jharrington/.pyenv/versions/3.3.2/lib/python3.3/json/encoder.py", line 173, in default
    raise TypeError(repr(o) + " is not JSON serializable")
TypeError: b'coveralls' is not JSON serializable