Call executeOnCompleteCallbacks in a finally block.

Changed CoGroupRDD's hash map from Scala to Java.

Add missing dependency spray-json to Maven build

Python API (PySpark)

fix spelling mistake in LocalLR example

fix spelling mistake

Executor and JobDescription JSON support added

add repositories section to quick-start SimpleJob pom.xml

Activate hadoop1 profile by default for maven builds

JSON support added to WebUI

Retrieve jars to a flat directory so * can be used for the classpath.

Fix an issue in ConnectionManager where sendMessage may create too many unnecessary connections

This is a temporary change until we port takeSample().

Added the io.spray JSON library

Log preferred hosts

Add RDD.tupleBy.