cqlsh: add support for multiline comments

patch by Aleksey Yeschenko; reviewed by Brandon Williams for
CASSANDRA-5798
Merge branch 'cassandra-1.2' into cassandra-2.0.0

Conflicts:
	CHANGES.txt
	bin/cqlsh
Merge branch 'cassandra-2.0.0' into cassandra-2.0
Merge branch 'cassandra-2.0' into trunk
one version of servlet-api is more than enough, remove the second
Handle CQL3 SELECT duplicate IN restrictions on clustering columns

patch by Aleksey Yeschenko; reviewed by Jonathan Ellis for
CASSANDRA-5856
Merge branch 'cassandra-1.2' into cassandra-2.0.0

Conflicts:
	CHANGES.txt
	src/java/org/apache/cassandra/cql3/statements/SelectStatement.java
Merge branch 'cassandra-2.0.0' into cassandra-2.0
Merge branch 'cassandra-2.0' into trunk
add triggers README
Merge branch 'cassandra-2.0.0' into cassandra-2.0
Merge branch 'cassandra-2.0' into trunk
fix ex message grammar
Merge branch 'cassandra-2.0.0' into cassandra-2.0
Merge branch 'cassandra-2.0' into trunk
remove dead field 'LAST_MIGRATION_KEY'
Update versions for 2.0.0 RC2 release
Comment that 0.0.0.0 may confuse some client drivers
Merge branch 'cassandra-1.2' into cassandra-2.0.0
Merge branch 'cassandra-2.0.0' into cassandra-2.0