SPARK-968, In stage UI, add an overview section that shows task stats grouped by executor id
Merge branch 'master' of https://github.com/leftnoteasy/incubator-spark-1
SPARK-968, added sc finalize code to avoid akka rebinding to the same port
Merge branch 'master' of git://github.com/apache/incubator-spark
spark-898, changes according to review comments
spark-968, changes for avoid a NPE
added changes according to comments from rxin
SPARK-968, added executor address showing in aggregated metrics by executors table
Merge pull request #244 from leftnoteasy/master

Added SPARK-968 implementation for review

Added SPARK-968 implementation for review