[core] Document paths have encoding problems

[23/Mar/2017 14:13:59 -0700] api2         ERROR    Error running <function get_document at 0x7f7de807aaa0>
Traceback (most recent call last):
  File "/home/romain/projects/hue/desktop/core/src/desktop/api2.py", line 55, in decorator
    return func(*args, **kwargs)
  File "/home/romain/projects/hue/desktop/core/src/desktop/api2.py", line 179, in get_document
    response = _get_document_helper(request, uuid, with_data, with_dependencies, path)
  File "/home/romain/projects/hue/desktop/core/src/desktop/api2.py", line 241, in _get_document_helper
    response['children'] = [doc.to_dict() for doc in response['children']]
  File "/home/romain/projects/hue/desktop/core/src/desktop/models.py", line 1149, in to_dict
    'path': urlencode(self.path or '/'),
  File "/home/romain/projects/hue/desktop/core/src/desktop/models.py", line 1077, in path
    quoted_name = urllib.quote(self.name)
  File "/usr/lib/python2.7/urllib.py", line 1288, in quote
    return ''.join(map(quoter, s))
KeyError: u'\xe9'
[23/Mar/2017 14:13:59 -0700] urllib       WARNING  /usr/lib/python2.7/urllib.py:1288: UnicodeWarning: Unicode equal comparison failed to convert both arguments to Unicode - interpreting them as being unequal
  return ''.join(map(quoter, s))
[23/Mar/2017 14:13:59 -0700] access       INFO     127.0.0.1 romain - "GET /desktop/api2/doc/ HTTP/1.1"