'Create and return a new Session Token based on the contents
of a previously saved JSON-format file.
:type file_path: str
:param file_path: The fully qualified path to the JSON-format
file containing the previously saved Session Token information.'

@classmethod
def load(cls, file_path):

    fp = open(file_path)
    json_doc = fp.read()
    fp.close()
    return cls.from_json(json_doc)
