Life360

In addition to authorization string, save credentials (api_token, username & password) to cache file. Then when loading, check to see if credentials are the same. If so, then use the cached authorization string. If they've changed, then throw away cache file and re-authorize. Bump major version since API (i.e., `__init__` parameters) changed. Also AuthInfoCallbackError no longer needed.

Add requests package as a dependency.

Add Life360 specific exceptions. Use unique exception for login errors.

Handle both HTTP 401 and 403 authorization errors. Remove cache file before re-authorizing.