code: func (c *Client) Collaboration(identifier string) (*Collaboration, error) {
  	col := new(Collaboration)
  	_, err := c.MakeApiRequest("GET", "/1.0/user/collaborations/"+identifier, nil, col)
  	if err != nil {
  		return nil, err
  	}
  	return col, err
  }
docs: // Collaboration retrieves a detailed view of one of the current user's
  // collaborations