Merge pull request #33 from mrk-its/master

Small fixes
fixing in operator per https://github.com/bdeggleston/cqlengine/issues/34
changing list column behavior to load lists, not tuples, from the database
Ignore empty batches instead of sending invalid CQL to Cassandra.
Allow multiple ORDER BY conditions to be set.

Supports both .order_by('foo', 'bar') and chained .order_by() calls.
Added a derived Date type.

Internally it is stored as a timestamp but the value is
exposed as a  instance.
Merge pull request #35 from dokai/empty-batch

Ignore empty batches instead of sending invalid CQL to Cassandra.
Merge branch 'multiple-order-by' of github.com:dokai/cqlengine into dokai-multiple-order-by

Conflicts:
	cqlengine/query.py
adding test around chaining order_by statements
Merge pull request #37 from dokai/date-column

Added a derived Date type.
making date deserialize with utc timezone
modifying pk comparison to look at the db_field_name, so it's not dependent on the ids being identical
Fixed issue with trying to call .close() on a None
Token function
do not call count() in QuerySet.__len__
QuerySet.values_list support