cqlsh: Updated CQL3 parser to support functions and BLOB literals

patch by Mikhail Stepura; reviewed by Aleksey Yeschenko for CASSANDRA-7018
Merge branch 'cassandra-1.2' into cassandra-2.0

Conflicts:
	CHANGES.txt
	bin/cqlsh
	pylib/cqlshlib/cql3handling.py
Merge branch 'cassandra-2.0' into cassandra-2.1

Conflicts:
	CHANGES.txt