BlockManager UI.
code Formatting
Nicer storage level format on RDD page
Merge branch 'master' into blockmanagerUI

Conflicts:
	core/src/main/twirl/spark/deploy/worker/index.scala.html
Merge branch 'master' into blockmanagerUI
Refactor BlockManager UI and adding worker details.
Merge branch 'master' into blockmanagerUI
Merge remote-tracking branch 'dennybritz/blockmanagerUI' into blockmanager_ui

Conflicts:
	core/src/main/scala/spark/RDD.scala
	core/src/main/scala/spark/storage/BlockManagerMaster.scala
	core/src/main/scala/spark/storage/StorageLevel.scala
Fix up some problems from the merge
Merge branch 'master' into blockmanager_ui

Conflicts:
	core/src/main/scala/spark/RDD.scala
code reformatting
switch to TimeStampedHashMap for storing persistent Rdds
fixup  1cadaa1, changed api of map
add metadatacleaner for persisentRdd map
Merge pull request #401 from squito/blockmanager_ui

Blockmanager ui