Merge pull request #880 from mateiz/ui-tweaks

bin/slaves.sh

bin/spark-daemon.sh

bin/start-slaves.sh

bin/stop-all.sh

...in/resources/spark/ui/static/bootstrap-responsive.min.css

core/src/main/resources/spark/ui/static/bootstrap.min.css

core/src/main/resources/spark/ui/static/webui.css

...c/main/scala/spark/deploy/master/ui/ApplicationPage.scala

core/src/main/scala/spark/deploy/master/ui/IndexPage.scala

core/src/main/scala/spark/deploy/worker/ui/IndexPage.scala

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

core/src/main/scala/spark/ui/Page.scala

core/src/main/scala/spark/ui/UIUtils.scala

core/src/main/scala/spark/ui/env/EnvironmentUI.scala

core/src/main/scala/spark/ui/exec/ExecutorsUI.scala

core/src/main/scala/spark/ui/jobs/IndexPage.scala

core/src/main/scala/spark/ui/jobs/PoolPage.scala

core/src/main/scala/spark/ui/jobs/StagePage.scala

core/src/main/scala/spark/ui/jobs/StageTable.scala

core/src/main/scala/spark/ui/storage/IndexPage.scala