Expose `isLocal` in SparkContext.

Hot fix for command runner

Spark on Yarn should use yarn approved directories for spark.local.dir and tmp

Spark on Yarn allow users to specify environment variables 

Pass SBT_OPTS environment through to sbt_launcher

Revert json library change

This reverts commit 1fb1b099, reversing
changes made to c69c4894.

Several Improvements to EC2 Scripts

Fix IDE project generation under SBT

Documentation suggestions for spark streaming.

Create less instances of the random class during ALS initialization.

Re-add removed dependency to fix build under Hadoop 0.23.9

Fixes SBT build under Hadoop 0.23.9 and 2.0.4

Update build docs

Synced sbt and maven builds to use the same dependencies, etc.

Coalesced RDD with locality

This reverts commit 66e7a38a.