Returns a default SubjectGuide model for the passed campus:
        seattle, bothell, tacoma

def get_default_subject_guide(campus='seattle'):
    """
    Returns a default SubjectGuide model for the passed campus:
        seattle, bothell, tacoma
    """
    url = "{}/{}/{}".format(subject_guide_url_prefix, 'defaultGuide', campus)
    headers = {'Accept': 'application/json'}

    response = SubjectGuide_DAO().getURL(url, headers)

    if response.status != 200:
        raise DataFailureException(url, response.status, response.data)

    data = json.loads(response.data)
    return _subject_guide_from_json(data)