Add support for building against hadoop2-yarn : adding new maven profile for it

bagel/pom.xml

core/pom.xml

...op1/scala/org/apache/hadoop/mapred/HadoopMapRedUtil.scala

...ala/org/apache/hadoop/mapreduce/HadoopMapReduceUtil.scala

...arn/scala/org/apache/hadoop/mapred/HadoopMapRedUtil.scala

...ala/org/apache/hadoop/mapreduce/HadoopMapReduceUtil.scala

...op2/scala/org/apache/hadoop/mapred/HadoopMapRedUtil.scala

...ala/org/apache/hadoop/mapreduce/HadoopMapReduceUtil.scala

core/src/main/scala/spark/PairRDDFunctions.scala

core/src/main/scala/spark/rdd/NewHadoopRDD.scala

examples/pom.xml

pom.xml

project/SparkBuild.scala

repl-bin/pom.xml

repl/pom.xml

streaming/pom.xml