Fix ascii codec can't decode byte 0xd0 in position 2279

Downloading/unpacking pyaml (from pytoolbox->-r /home/famille/souvenirs_test/server/requirements.txt (line 18))
  Downloading pyaml-13.12.0.tar.gz
  Running setup.py (path:/tmp/pip_build_famille/pyaml/setup.py) egg_info for package pyaml
    Traceback (most recent call last):
      File "<string>", line 17, in <module>
      File "/tmp/pip_build_famille/pyaml/setup.py", line 9, in <module>
        try: readme = open(os.path.join(pkg_root, 'README.txt')).read()
      File "/usr/lib/python3.3/encodings/ascii.py", line 26, in decode
        return codecs.ascii_decode(input, self.errors)[0]
    UnicodeDecodeError: 'ascii' codec can't decode byte 0xd0 in position 2279: ordinal not in range(128)
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):

  File "<string>", line 17, in <module>

  File "/tmp/pip_build_famille/pyaml/setup.py", line 9, in <module>

    try: readme = open(os.path.join(pkg_root, 'README.txt')).read()

  File "/usr/lib/python3.3/encodings/ascii.py", line 26, in decode

    return codecs.ascii_decode(input, self.errors)[0]

UnicodeDecodeError: 'ascii' codec can't decode byte 0xd0 in position 2279: ordinal not in range(128)