Updated koboli.ini, koboli.py

Hi, Jeff.  I just started playing around with Koboli and I figured I'd try to start out on the right foot by offering a few local changes I'd made.  Pretty minimal stuff, but I thought it might be useful:

* Added config comment in koboli.ini to show nagios.cmd path
* Added support for /usr/local/etc/koboli to koboli.py, as fallback in case /etc/koboli fails.

Best regards.