Dont return hosts outside of the datacenter of the specified connection host. Fixes #137
add changes.txt

Conflicts:
	CHANGES.txt
Merge pull request #169 from mediacrossinginc/issue137b

Don't use hosts outside the datacenter of the connection host
Merge branch 'b1.0' of https://github.com/datastax/spark-cassandra-connector
Add missing issue number in CHANGES.txt
Merge branch 'b1.0' of https://github.com/datastax/spark-cassandra-connector