upgraded sbt version, sbt plugins and some library dependencies to latest stable version
added SPARK_WORKER_INSTANCES : allows spawning multiple worker instances/processes on every slave machine
spark instance number must be present in log filename to prevent multiple workers from overriding each other's logs
Fixed broken filter in getWritableClass[T]
Correct sense of 'filter out' in comment.
Merge pull request #548 from markhamstra/getWritableClass_filter

Fixed broken filter in getWritableClass[T]
Corrected order of CountMinSketchMonoid arguments
Fix argv handling in Python transitive closure example
Fix Python saveAsTextFile doctest to not expect order to be preserved
Merge pull request #551 from jey/python-bugfixes

Python bugfixes
Merge pull request #550 from erikvanoosten/master

corrected Algebird example
Bumping Algebird version in examples now that it supports JDK 1.6
Update build to Scala 2.9.3
Merge pull request #554 from andyk/scala2.9.3

Fixes SPARK-723 - Update build to Scala 2.9.3
Merge pull request #552 from MLnick/master

Bumping version for Twitter Algebird to latest
Update Scala version in docs
Fix deprecated warning
Updated link to SBT
Merge remote-tracking branch 'kalpit/master'

Conflicts:
	project/SparkBuild.scala
Fix compile warning