Let users know that long, double dashed, options are not supported. Fixes #28.

We still support long options, though they are only prefixed with a single dash.
Include a double dashed test case.
Merge pull request #29 from s0undt3ch/issues/28

Let users know that long, double dashed, options are not supported. Fixes #28.
We no longer support any form of long options. Fixes #28.

Added missing opt strings, `-M|-N|-S`.