Merge pull request #905 from mateiz/docs2

conf/fairscheduler.xml.template

core/src/main/scala/org/apache/spark/SparkContext.scala

...org/apache/spark/scheduler/cluster/ClusterScheduler.scala

...g/apache/spark/scheduler/cluster/SchedulableBuilder.scala

...ala/org/apache/spark/scheduler/local/LocalScheduler.scala

.../main/scala/org/apache/spark/ui/UIWorkloadGenerator.scala

.../scala/org/apache/spark/ui/jobs/JobProgressListener.scala

...pache/spark/scheduler/cluster/ClusterSchedulerSuite.scala

...rg/apache/spark/scheduler/local/LocalSchedulerSuite.scala

docs/_layouts/global.html

docs/cluster-overview.md

docs/configuration.md

docs/contributing-to-spark.md

docs/ec2-scripts.md

docs/hadoop-third-party-distributions.md

docs/img/cluster-overview.png

docs/img/cluster-overview.pptx

docs/img/spark-logo-hd.png

docs/index.md

docs/job-scheduling.md