Clean up old URLs with (at least) spaces

[davidbgk]

Currently, there are issues when saving a dataset which contains resources with URLs containing spaces:

ERROR: Exception on /api/1/datasets/5369930ba3a729239d2040a4/ [PUT]
  | Traceback (most recent call last):
  |   File "/Users/david/Envs/udata/lib/python2.7/site-packages/flask/app.py", line 1612, in full_dispatch_request
  |     rv = self.dispatch_request()
  |   File "/Users/david/Envs/udata/lib/python2.7/site-packages/flask/app.py", line 1598, in dispatch_request
  |     return self.view_functions[rule.endpoint](**req.view_args)
  |   File "/Users/david/Envs/udata/lib/python2.7/site-packages/flask_restplus/cors.py", line 38, in wrapped_function
  |     resp = make_response(f(*args, **kwargs))
  |   File "/Users/david/Sites/pro/etalab/udata/udata/api/__init__.py", line 97, in wrapper
  |     return func(*args, **kwargs)
  |   File "/Users/david/Envs/udata/lib/python2.7/site-packages/flask_restplus/api.py", line 313, in wrapper
  |     resp = resource(*args, **kwargs)
  |   File "/Users/david/Envs/udata/lib/python2.7/site-packages/flask/views.py", line 84, in view
  |     return self.dispatch_request(*args, **kwargs)
  |   File "/Users/david/Envs/udata/lib/python2.7/site-packages/flask_restplus/resource.py", line 44, in dispatch_request
  |     resp = meth(*args, **kwargs)
  |   File "/Users/david/Sites/pro/etalab/udata/udata/api/__init__.py", line 88, in wrapper
  |     return func(*args, **kwargs)
  |   File "/Users/david/Envs/udata/lib/python2.7/site-packages/flask_restplus/marshalling.py", line 101, in wrapper
  |     resp = f(*args, **kwargs)
  |   File "/Users/david/Sites/pro/etalab/udata/udata/core/dataset/api.py", line 133, in put
  |     return form.save()
  |   File "/Users/david/Envs/udata/lib/python2.7/site-packages/flask_mongoengine/wtf/models.py", line 21, in save
  |     self.instance.save(**kwargs)
  |   File "/Users/david/Envs/udata/lib/python2.7/site-packages/mongoengine/document.py", line 320, in save
  |     self.validate(clean=clean)
  |   File "/Users/david/Envs/udata/lib/python2.7/site-packages/mongoengine/base/document.py", line 402, in validate
  |     raise ValidationError(message, errors=errors)
  | ValidationError: ValidationError (Dataset:5369930ba3a729239d2040a4) (url.Invalid URL: http://www.data.rennes-metropole.fr/fileadmin/user_upload/data/Bibliotheques/prêts au 1er oct 2013.xls 1.url.Invalid URL: http://www.data.rennes-metropole.fr/fileadmin/user_upload/data/Bibliotheques/Types lecteurs.xls 2.url.Invalid URL: http://www.data.rennes-metropole.fr/fileadmin/user_upload/data/Bibliotheques/Types exemplaires.xls 3.url.Invalid URL: http://www.data.rennes-metropole.fr/fileadmin/user_upload/data/Bibliotheques/Métiers CSP.xls 4.url.Invalid URL: http://www.data.rennes-metropole.fr/fileadmin/user_upload/data/Bibliotheques/Localisation BQ.xls 6.url.Invalid URL: http://www.data.rennes-metropole.fr/fileadmin/user_upload/data/Bibliotheques/Dewey 2009 LCL.xls 7.url.Invalid URL: http://www.data.rennes-metropole.fr/fileadmin/user_upload/data/Bibliotheques/documentation_prêts au 1er oct 2013.txt: ['resources'])

A command to clean up these URLs should fix that.