Update version for 1.2.0 final
Minor CQL3 doc fixes
Merge tag 'cassandra-1.2.0' into cassandra-1.2

Apache Cassandra 1.2.0 release
Allow non-schema system ks modification for shuffle to work;
patch by Jouni Hartikainen, reviewed by Aleksey Yeschenko for
CASSANDRA-5097
Merge branch 'cassandra-1.2' into trunk