@classmethod
def create(cls, access_token=None, url=
    'https://api.icmobile.singlewire.com/api/v1-DEV', **kwargs):
    """Helper function to create a custom Hammock wrapper for InformaCast Mobile"""
    if not access_token:
        raise ValueError('Access token must be supplied')
    if not url:
        raise ValueError('URL must be supplied')
    headers = {'Authorization': 'Bearer ' + access_token,
        'X-Client-Version': 'ICMPython 0.0.1'}
    if 'headers' in kwargs:
        headers.update(kwargs['headers'])
        kwargs['headers'] = headers
    else:
        kwargs['headers'] = headers
    return cls(url, **kwargs)
