additional test that tests what happens when a subset of columns are provided while inserting a ColumnFamilyMap instances
additional test that tests what happens when a subset of columns are provided while inserting a ColumnFamilyMap instances

 - note that the instance created when some columns are provided and others are not will not be identical to the instance created by pycassa when pulling the same row from Cassandra
pycassa/pycassa,pycassa/pycassa