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.

Implementing SPARK-838: Add DoubleRDDFunctions methods to PySpark

Right now it seems like something has gone wrong when this message is printed out.
Instead, this is a normal condition. So I changed the message a bit.

Conflicts:
	ec2/spark_ec2.py

Removed meaningless types