added CQL3 collections support, unit tests, and integration tests.
upped the version number to 1.2.1
bumped version # to 1.2.3
Merge pull request #136 from Aaronontheweb/master

Super counter column support + unit tests + unit test bug fixes
fixed an issue with ListTypes and NullTypes where it didn't perform a null check on read correctly
Merge pull request #139 from Aaronontheweb/cql3-collections

CQL3 collection support