Without this, ActiveRecord does not yet know which type of adapter to
use. This makes monkey patching the specific adapter class(es) that you
need impossible.

This mirrors what we do in the spec helper.

These were typos in the URLs for comparison links between versions. They
should now all work correctly.

When using `add_column`, the definition methods for `ksuid` and
`ksuid_binary` are not used like when using `table.ksuid` since
`add_column` creates the column directly.

This change makes it so any column definition can handle both `ksuid`
and `ksuid_binary` correctly by monkey-patching the method that creates
the column definitions.

This change makes it so `rails generate model example:ksuid` works as
expected. I am unsure how fragile this test is. Ideally, we would have a
test that runs the generator against a dummy app and asserts on the
outcome, but I don't have the spoons to manage that right now.