merged dev branch

.gitignore

core/src/main/resources/spark/deploy/master/webui/index.html

...esources/spark/deploy/static/bootstrap-responsive.min.css

.../src/main/resources/spark/deploy/static/bootstrap.min.css

core/src/main/resources/spark/deploy/static/sorttable.js

core/src/main/resources/spark/deploy/static/spark_logo.png

core/src/main/resources/spark/deploy/worker/webui/index.html

core/src/main/scala/spark/CacheTracker.scala

core/src/main/scala/spark/deploy/DeployMessage.scala

core/src/main/scala/spark/deploy/master/Master.scala

core/src/main/scala/spark/deploy/master/MasterWebUI.scala

core/src/main/scala/spark/deploy/master/WorkerInfo.scala

core/src/main/scala/spark/deploy/worker/ExecutorRunner.scala

core/src/main/scala/spark/deploy/worker/Worker.scala

core/src/main/scala/spark/deploy/worker/WorkerWebUI.scala

core/src/main/scala/spark/storage/BlockManager.scala

core/src/main/twirl/common/layout.scala.html

core/src/main/twirl/masterui/executor_row.scala.html

core/src/main/twirl/masterui/executors_table.scala.html

core/src/main/twirl/masterui/index.scala.html