Allow executing CREATE statement multiple times

patch by slebresne; reviewed by jbellis for CASSANDRA-6471
Merge branch 'cassandra-1.2' into cassandra-2.0

Conflicts:
	CHANGES.txt
Fix infinite loop when paging queries with IN

patch by slebresne; reviewed by iamaleksey for CASSANDRA-6464
Merge branch 'cassandra-2.0' into trunk
Fix merge
Don't send confusing info on timeouts

patch by slebresne; reviewed by jbellis for CASSANDRA-6491
Merge branch 'cassandra-1.2' into cassandra-2.0

Conflicts:
	CHANGES.txt
	src/java/org/apache/cassandra/service/ReadCallback.java
	src/java/org/apache/cassandra/service/StorageProxy.java
Merge branch 'cassandra-2.0' into trunk
Merge branch 'trunk' of http://git-wip-us.apache.org/repos/asf/cassandra into trunk