Fix typo in link back to The Druid Cluster page.
fix by segment results

1) fix class cast in by segment results
2) exclude old netty version coming from curator
merge changes from master
Merge pull request #494 from metamx/fix-bysegment-results

fix bySegmentResults
Merge pull request #493 from phungleson/fix-link-typo

Fix typo in the link back to The Druid Cluster page.