Document exception

[mjuenema]

try:
    s.user_list('does_not_exist')
except sigfoxapi.SigfoxError as e:
   pass     # Deal with exception

sigfoxapi.NONE_ERRORS    # on what errors???

[mjuenema]

Only raise exception on what codes? Return None on 404?

The Sigfox API uses a limited number of HTTP status codes:

• 200: request was successfully processed, and its result is sent in the response body
• 400: bad request, some required parameters are missing or their value is not valid
• 401: authentication credentials were not present or invalid
• 403: access denied, the request is not authorized with your credentials or the action is forbidden owing to some constraints
• 404: resource was not found for the given request
• 500: an unexpected error occured

[mjuenema]

Set sigfox.http_status