Fixed naming issues and added back ability to specify max task failures.

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

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

...n/scala/org/apache/spark/scheduler/SchedulerBackend.scala

...main/scala/org/apache/spark/scheduler/TaskScheduler.scala

...ain/scala/org/apache/spark/scheduler/TaskSetManager.scala

...ark/scheduler/cluster/CoarseGrainedSchedulerBackend.scala

...spark/scheduler/cluster/mesos/MesosSchedulerBackend.scala

core/src/test/scala/org/apache/spark/FailureSuite.scala

...la/org/apache/spark/scheduler/ClusterSchedulerSuite.scala

.../scala/org/apache/spark/scheduler/DAGSchedulerSuite.scala

...la/org/apache/spark/scheduler/TaskResultGetterSuite.scala

...cala/org/apache/spark/scheduler/TaskSetManagerSuite.scala

...apache/spark/scheduler/cluster/YarnClusterScheduler.scala