Fixed init script to use daemon and to producte output that goes along with other init script for RedHat/CentOS.
Initd script clean and config for nagios package and stopping behavior

Since this script is intended for RedHat/CentOS I've adjusted the
configuration to use the paths for the Nagios package.

Changed the way the daemon is stopped, using killproc so we don't rely
on the pid file that could change place.
Fixed wrong path to nagios log file.
Merge pull request #28 from numkem/master

Initd file fixes