Serialize accumulator updates in TaskResult for local mode.
Changed Spark version back to 0.6.0
Updated Kryo to 2.20.
Allow EC2 script to stop/destroy cluster after master/slave failures.
Support for Hadoop 2 distributions such as cdh4
Use SPARK_MASTER_IP if it is set in start-slaves.sh.
Merge pull request #287 from rxin/startslave

Use SPARK_MASTER_IP if it is set in start-slaves.sh.
Merge tag 'v0.6.0' into python-api
Update Python API for v0.6.0 compatibility.
Added functionality to forget RDDs from DStreams.
Add PySpark README and run scripts.
Adding whitespace to test JIRA integration
SPARK-581 #resolve Removing whitespace to test JIRA
Merge pull request #290 from pwendell/dev

Two trivial commits to test JIRA integration
Fix a path in the web UI
Merge pull request #285 from tomdz/cdh4-dev

Support for Hadoop 2 distributions such as cdh4
Merge branch 'master' into dev
Fixed some bugs in tests for forgetting RDDs, and made sure that use of manual clock leads to a zeroTime of 0 in the DStreams (more intuitive).
Added MapValueDStream, FlatMappedValuesDStream and CoGroupedDStream, and therefore DStream operations mapValue, flatMapValues, cogroup, and join. Also, added tests for DStream operations filter, glom, mapPartitions, groupByKey, mapValues, flatMapValues, cogroup, and join.
Remove PYTHONPATH from SparkContext's executorEnvs.

It makes more sense to pass it in the dictionary
of environment variables that is used to construct
PythonRDD.