Allow input specification for input names containing dots

[jeffbaumes]

Currently we get

{
  "message":"OperationFailure: OperationFailure(u\"The dotted field 'comm.bc.dist' in 'kwargs.outputs.comm.bc.dist' is not valid for storage.\",)",
  "trace":[
    [
      "/usr/local/lib/python2.7/dist-packages/girder/api/rest.py",
      277,
      "endpointDecorator",
      "val = fun(self, args, kwargs)"
    ],
    [
      "/usr/local/lib/python2.7/dist-packages/girder/api/rest.py",
      869,
      "POST",
      "return self.handleRoute(method, path, params)"
    ],
    [
      "/usr/local/lib/python2.7/dist-packages/girder/api/rest.py",
      636,
      "handleRoute",
      "val = handler(**kwargs)"
    ],
    [
      "/usr/local/lib/python2.7/dist-packages/girder/api/access.py",
      62,
      "accessDecorator",
      "return fun(*args, **kwargs)"
    ],
    [
      "/usr/local/lib/python2.7/dist-packages/girder/api/rest.py",
      918,
      "wrapped",
      "return fn(self.ctx, *args, **kwargs)"
    ],
    [
      "/usr/local/lib/python2.7/dist-packages/girder/api/rest.py",
      225,
      "wrapped",
      "return fun(*args, **kwargs)"
    ],
    [
      "/usr/local/lib/python2.7/dist-packages/girder/plugins/romanesco/server/__init__.py",
      313,
      "romanescoRun",
      "job = jobModel.save(job)"
    ],
    [
      "/usr/local/lib/python2.7/dist-packages/girder/models/model_base.py",
      295,
      "save",
      "document['_id'] = self.collection.save(document)"
    ],
    [
      "/usr/local/lib/python2.7/dist-packages/girder/external/mongodb_proxy.py",
      65,
      "__call__",
      "return self.method(*args, **kwargs)"
    ],
    [
      "/usr/local/lib/python2.7/dist-packages/pymongo/collection.py",
      288,
      "save",
      "manipulate, safe, check_keys=check_keys, **kwargs)"
    ],
    [
      "/usr/local/lib/python2.7/dist-packages/pymongo/collection.py",
      552,
      "update",
      "_check_write_command_response(results)"
    ],
    [
      "/usr/local/lib/python2.7/dist-packages/pymongo/helpers.py",
      209,
      "_check_write_command_response",
      "raise OperationFailure(error.get(\"errmsg\"), error.get(\"code\"), error)"
    ]
  ],
  "type":"internal"
}

[zachmullen]

I like the solution of serializing the kwargs to a string before saving it, and unserializing it when loading the job model. That way the client/server API is unchanged.