ASCII Readme

[notpeter]

Currently setup.py pulls in the long description from the README.md: (long_description=read('README.md')

Sadly, because you have unicode emdashes ("\xe2\x80\x93" instead of "--") in the readme.md python will fail trying to stringify those characters and error with:

Collecting jws>=0.1.3 (from python_jwt==1.1.0->-r /tmp/tmpEbDt97/requirements.txt (line 27))
  Downloading jws-0.1.3.tar.gz
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-build-db5dsmc7/jws/setup.py", line 17, in <module>
        long_description=read('README.md'),
      File "/tmp/pip-build-db5dsmc7/jws/setup.py", line 5, in read
        return open(os.path.join(os.path.dirname(__file__), fname)).read()
      File "/venv3/lib/python3.5/encodings/ascii.py", line 26, in decode
        return codecs.ascii_decode(input, self.errors)[0]
    UnicodeDecodeError: 'ascii' codec can't decode byte 0xe2 in position 500: ordinal not in range(128)

To reproduce, under Python 3.5 run: LC_CTYPE=C pip3 install jws

This fixes this, but it would require a subsequent point release (0.1.4) to actually to keep it from happening on future pip installs.

[notpeter]

I just noticed this is the same issue fixed in #21.

[graingert]

@brianloveswords ping