Bump CQL version to 3.2.0 and update CQL docs

Patch by Tyler Hobbs; reviewed by Aleksey Yeschenko for CASSANDRA-7527
Merge branch 'cassandra-2.1.0' into cassandra-2.1
Fix configuration error when running nodetool ring

Patch by Tyler Hobbs; reviewed by Jeremiah Jordan for CASSANDRA-7508
Merge branch 'cassandra-2.1.0' into cassandra-2.1
Merge branch 'cassandra-2.1' into trunk

Conflicts:
	CHANGES.txt