Initial commit of camera control script

This commit takes the basic bash script that I found at

http://a-more-common-hades.blogspot.com/2011/02/foscam-control-script-etc.ht

and adds my initial customizations to it. Many props to JM at
a-more-common-hades.blogspot.com, without his post, I would not have
ever gotten any of this working.

This version adds some error checking, logging, multiple camera support,
among other minor additions. I hope to clean this up more and add more
functionality, for example, cleaner command line argument parsing.
Update README

Add basic info and examples to the README.