Update versions for 1.2.13 release
Randomize batchlog candidates selection

patch by Aleksey Yeschenko; reviewed by Jonathan Ellis for
CASSANDRA-6481
Merge branch 'cassandra-1.2' into cassandra-2.0

Conflicts:
	NEWS.txt
	build.xml
	debian/changelog
Set javaagent for tools.
Patch by Sam Tunnecliffe, reviewed by brandonwilliams for CASSANDRA-6404
Merge branch 'cassandra-1.2' into cassandra-2.0
Fix CHANGES.txt
Merge branch 'cassandra-1.2' into cassandra-2.0

Conflicts:
	CHANGES.txt