Ability to freeze UDT

patch by slebresne; reviewed by iamaleksey for CASSANDRA-7857
remove shuffle again
Merge branch 'cassandra-2.1.0' into cassandra-2.1

Conflicts:
	CHANGES.txt
Merge branch 'cassandra-2.1' into trunk
Make disruptor_thrift_server invocation pool configurable
patch by Pavel Yaskevich; reviewed by Jason Brown for CASSANDRA-7594
Require arg types to disambiguate UDF drops

Patch by Robert Stupp; reviewed by Tyler Hobbs for CASSANDRA-7812
Don't allow mixed multi/single column relations

Patch by Benjamin Lerer; reviewed by Tyler Hobbs for CASSANDRA-7711
Fix NPE when using collections in frozen tuple

patch by omichallat; reviewed by slebresne for CASSANDRA-7869
Merge branch 'cassandra-2.0' into cassandra-2.1

Conflicts:
	CHANGES.txt
	build.xml
	lib/thrift-server-0.3.5.jar
	lib/thrift-server-0.3.6.jar
Merge branch 'cassandra-2.0' into cassandra-2.1.0
Merge branch 'cassandra-2.1.0' into cassandra-2.1
Merge branch 'cassandra-2.1' into trunk

Conflicts:
	CHANGES.txt
Merge branch 'cassandra-2.0' into cassandra-2.1.0
Merge branch 'cassandra-2.0' into cassandra-2.1

Conflicts:
	CHANGES.txt
	src/java/org/apache/cassandra/cql3/statements/SelectStatement.java
	test/unit/org/apache/cassandra/cql3/MultiColumnRelationTest.java
Merge branch 'cassandra-2.1.0' into cassandra-2.1
Merge branch 'cassandra-2.1' into trunk
Accept Java source code for user-defined functions

Patch by Robert Stupp; reviewed by Tyler Hobbs for CASSANDRA-7562
add license for javassist
update thrift-server license to 0.3.6
Expose CFMetaData#isDense()