Update ns4600.py to work with f/w 02.01.0000.22

The shutdown function in the ns4600.py module was broken by newer
firmware.  There is no shutdown.php page anymore.  This is an attempt
at getting this module working again.  It appears to work fine, but
my python and ajax could use some sprucing up.
Clean up utility that uses the ns4600.py module

Rename the "example" utility to ns4600control.  This utility is much
more robust now.  It also can take a settings file as input, so that
code is not intermingled with the settings.
Merge pull request #1 from hawartens/master

Update ns4600.py to work with f/w 02.01.0000.22, add ns4600control script