Fix ArrayIndexOutOfBoundsException in 2ndary index query

patch by slebresne; reviewed by lyubent for CASSANDRA-6470
Fix ArrayIndexOutOfBoundsException in 2ndary index query

patch by slebresne; reviewed by lyubent for CASSANDRA-6470
Release sstables upon rebuilding 2i

patch by Sergio Bossa; reviewed by Aleksey Yeschenko for
CASSANDRA-6635
Merge branch 'cassandra-2.0' into trunk

Conflicts:
	CHANGES.txt
	src/java/org/apache/cassandra/db/DataRange.java
	src/java/org/apache/cassandra/db/index/SecondaryIndex.java