#88 - Created KVRowReader which allows to map rows to pairs of objects
#88:  Support pairs of KV pairs represented as Scala tuples. Remove KV class.
#88 defined columnCount and columnNames in KerValueRowReader and added offset to getColumnName in ClassBasedRowReader
Merge pull request #293 from datastax/wip-88-pkolaczk

#88:  Support pairs of KV pairs represented as Scala tuples. Remove KV c...
Merge pull request #289 from datastax/wip-88

#88 - Created KVRowReader which allows to map rows to pairs of objects