add nodetool enablebackup/disablebackup
patch by pmargolin reviewed by dbrosius for CASSANDRA-5556
Ensure that submitBackground enqueues at least one task
patch by Oleg Anastasyev; reviewed by jbellis for CASSANDRA-5554
fix memorySize bugs and cleanup
patch by Carl Yeksigian and jbellis for CASSANDRA-5564
revert CASSANDRA-5523
make BytesToken.toString only return hex bytes
patch by Juraj Sustek; reviewed by jbellis for CASSANDRA-5566
sstablescrub respects MAX_HEAP_SIZE
Patch by Mina Naguib, reviewed by brandonwilliams for CASSANDRA-5562
cqlsh: fix DESCRIBE after case insensitive USE

patch by Aleksey Yeschenko; reviewed by Brandon Williams for
CASSANDRA-5567
Update debian changelog date
Ninja-fix CQL3 version in CQL.textile