Updated docs for SparkConf and handled review comments

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

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

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

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

...in/scala/org/apache/spark/api/java/JavaSparkContext.scala

...in/scala/org/apache/spark/deploy/FaultToleranceTest.scala

core/src/main/scala/org/apache/spark/executor/Executor.scala

core/src/main/scala/org/apache/spark/util/Utils.scala

core/src/test/resources/spark.conf

docs/_config.yml

docs/configuration.md

docs/css/bootstrap.min.css

docs/job-scheduling.md

docs/monitoring.md

docs/python-programming-guide.md

docs/quick-start.md

docs/running-on-mesos.md

docs/scala-programming-guide.md

docs/spark-standalone.md

docs/streaming-programming-guide.md