Add DateTieredCompactionStrategy

Patch by Bjorn Hegerfors; reviewed by marcuse for CASSANDRA-6602
Merge branch 'cassandra-2.0' into cassandra-2.1

Conflicts:
	NEWS.txt
Merge branch 'cassandra-2.1' into trunk
Emit metrics for CAS

Patch by Sankalp Kohli, reviewed by brandonwilliams for CASSANDRA-7341
Merge branch 'cassandra-2.0' into cassandra-2.1
Emit metrics for CAS

Patch by Sankalp Kohli, reviewed by brandonwilliams for CASSANDRA-7341
Merge branch 'cassandra-2.1' into trunk

Conflicts:
	src/java/org/apache/cassandra/service/paxos/PaxosState.java
Emit metrics for CAS

Patch by Sankalp Kohli, reviewed by brandonwilliams for CASSANDRA-7341
Merge branch 'cassandra-2.0' into cassandra-2.1
Merge branch 'cassandra-2.1' into trunk
Update yaml comment about rpc_max_threads with HSHA

Patch by Mike Adamson, reviewed by brandonwilliams for CASSANDRA-8116
Merge branch 'cassandra-2.0' into cassandra-2.1
Merge branch 'cassandra-2.1' into trunk
add missing file
Merge branch 'cassandra-2.0' into cassandra-2.1
Merge branch 'cassandra-2.1' into trunk
Force batchlog replay before decommissioning a node

patch by Branimir Lambov; reviewed by Aleksey Yeschenko for
CASSANDRA-7446
Merge branch 'cassandra-2.0' into cassandra-2.1

Conflicts:
	CHANGES.txt
	src/java/org/apache/cassandra/db/BatchlogManager.java
Merge branch 'cassandra-2.1' into trunk
Properly reject token function in DELETE statements

patch by slebresne; reviewed by thobbs for CASSANDRA-7747