add BigInt column
Allow use of timezone aware datetimes in {Max,Min}TimeUUID

Convert the given timezone aware datetimes to UTC in a similar manner
as the DateTime column type does instead of resulting in an error.
fixed authors
adding stubbed ttl query tests
adding batch and ttl to docs
adding failing tests for empty container column saving
adding update method to model docs
separating inserts, updates, column deletes and query value logic
ttls are working off the Class and instance
ttl statement fragment
updating update method to only issue set statements for modified rows and counters
fixing container column bug that would write insert empty container columns
adding tests around empty container insert bug fix
added consistency constants to top level
merged blind updates
test that ensures TTL is called on update
adding update method to model
TTL working for save on an update
updating changelog
fixing update errors