Made the assembly integration more precise, and disabled by default for the demos module. Added a system property flag to enable assembly task for demos.
Add simple script to deploy demo assembly fat jar to local spark master. Fixes #126.

Conflicts:
	CHANGES.txt
Fixed incorrect merge with #126 breaking sbt assembly for demos.
Merge branch 'b1.0' of https://github.com/datastax/spark-cassandra-connector

Conflicts:
	CHANGES.txt