mojombo/chronic — pull request #269 by dnagir (2014-07-02 08:14:50+00:00)
Title: Raise error on unsupported options

Theis will be usefull to eliminate all
the possible confusion going on what options
are and are not supported by chronic.

One such example is:
https://github.com/mojombo/chronic/issues/182#issuecomment-47094623

It is a good idea to tell people know about it in advance
if they provide invalid or unsupported options.