Pushed Config definitions down to subclasses - all inherit from Starter#Config
Merge branch 'master' of https://github.com/intel-hadoop/gearpump
use trait instead of class for Starter.Config
Merge pull request #1 from clockfly/master

metrics system for gearpump
Merge pull request #2 from clockfly/master

update guide about grafana dashboard
Provide a WorkerExectorContext which can add extra jvm opts
Revert "Provide a WorkerExectorContext which can add extra jvm opts"

This reverts commit 48ad268b17fd144ca2e2ab17d86e7da3457e46c4.
sync with github.com/clockfly/gearpump
add logo
Merge remote-tracking branch 'upstream/master'