Initial changes for opscenter
Added opscenter agent recipe
Removed runit implementation because of background forking
Switched to agent template, plus some additional changes
Updated README
Merge branch 'opscenter' of github.com:gansbrest/cassandra-chef-cookbook into opscenter
Merge branch 'upstream_master' into opscenter

Conflicts:
	README.md
Small fix
One more change to README
Merge pull request #25 from gansbrest/opscenter

Added datastax opscenter implementation for cluster monitoring