Cleans up the usage to indicate required parameters
Makes the OSD ID optional

If an OSD ID is not passed, it will check every OSD on the given host
Optionally warns about OSDs that are down and out
Updates the README.md file to match the changes
Adds an example of the osd-host monitoring
Merge branch 'feature_osd_improvements' of https://github.com/hufman/ceph-nagios-plugins into hufman-feature_osd_improvements

Conflicts:
	src/check_ceph_osd
v1.1.0 for hufman improvements
escape IPv4 and IPv6 host address