ComparatorTypes now accept 'reversed' qualifiers

Changelog:
- ComparatorTypes now accept 'reversed' qualifiers for both simple and
composite types.
- Added unit tests to cover these new features.
- Added integration tests to cover these new features.

Signed-off-by: Marc CARRÉ <carre.marc@gmail.com>

URL: https://github.com/marccarre/cassandra-unit/commit/288b8558be809ee4c10d0ab9701abac730e463d5