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
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
Update docs, bump CQL3 version, correct CHANGES.txt for CASSANDRA-6395
add client encryption support to sstableloader
patch by Sam Tunnicliffe; reviewed by Mikhail Stepura for CASSANDRA-6378
add SSLTransportFactory.java