No documentation for -Sbinary (and others)

[denilsonsa]

It seems #64 and 488bac3 added support for -Sbinary option. That's good, except that it is now undocumented. If I look at the zbarimg manpage, I can't find it in there. It seems there is also -Suncertainty, which is also undocumented. There may be others, though.

The solution should be fairly simple: add those items to the documentation and test if the generated manpage looks fine.

Bonus points for adding an example of decoding raw binary data in the examples section (of both manpages).

P.S.: I learned about that option via this Stack Overflow answer. One should not rely on Stack Overflow as a substitute for proper documentation.