first steps to getting shiro auth in
use jersey2 via netty for REST API

implement Metrics filters for jersey2
use Jersey 2 injection for access to Core.class in rest resources
fixed path for test
this needs the currently unreleased org.graylog2:jersey-netty module (also on github)
Merge remote-tracking branch 'origin/play' into play-shiro
Merge remote-tracking branch 'private/play' into play-shiro
Merge remote-tracking branch 'origin/play' into play-shiro
Merge remote-tracking branch 'origin/play' into play-shiro
load user via authenticated REST call
Merge remote-tracking branch 'origin/play' into play-shiro