Fix json2sstable handling of range tombstones

patch by Lyuben Todorov; reviewed by Aleksey Yeschenko for
CASSANDRA-6316
Fixing missing one row during reverse query on compact tables

patch by slebresne; reviewed by iamaleksey for CASSANDRA-6330
Fix reading expired row value from row cache
patch by jbellis; reviewed by Mikhail Stepura for CASSANDRA-6325
Fix AssertionError when doing set element deletion

patch by slebresne; reviewed by iamaleksey for CASSANDRA-6341
Make the CL native protocol code match the on in 2.0

patch by slebresne; reviewed by jasobrown for CASSANDRA-6347
Invalidate row cache when dropping CF
patch by Fabien Rousseau; reviewed by jbellis for CASSANDRA-6351
Improve error message
Disallow updating CQL3 tables from thrift

patch by slebresne; reviewed by jbellis for CASSANDRA-6370
Fix size computation of prepared statements

patch by slebresne; reviewed by lyubent for CASSANDRA-6369
Fix typo
add missing String.format parameter
Add missing file