POC using yammer metrics ( http://metrics.codahale.com ) in NX.
hook up default deadlock healthcheck
notes why ctor args needed
Merge branch 'master' into yammer-metrics

Conflicts:
	nexus-core/src/main/java/org/sonatype/nexus/guice/NexusModules.java
Pickup latest security for mediator fix
Drop old @Timed support
Trying to get security working... failing
Trying to get security working... still failing
maybe security is working now?
note about healthcheck and discovery
perm is working now, kill misleading comment
headers
add metrics*.jar to list of hacky shared muckity muck
reduce metrics bits in magical shared libs thingy
note about setting port in ctor, bring back setting of host via setter
update test since there is a new role metrics-endpoints
Merge pull request #779 from sonatype/yammer-metrics

REVIEW: Add yammer metrics ( http://metrics.codahale.com ) to NX