Identicon generation using pre-hashed data will always raise a ValueError. Regular data works fine.

The traceback received is similar to:

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Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/home/branko/.virtualenvs/django-pydenticon/local/lib/python2.7/site-packages/pydenticon/__init__.py", line 302, in generate
digest_byte_list = self._data_to_digest_byte_list(data)
File "/home/branko/.virtualenvs/django-pydenticon/local/lib/python2.7/site-packages/pydenticon/__init__.py", line 177, in _data_to_digest_byte_list
return [int(digest[i * 2:i * 2 + 2], 16) for i in range(16)]
ValueError: invalid literal for int() with base 16: 'U\xd2'
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