Model loading strategy
Merge pull request #21 from 12-oz/brandur-laod-models

Model loading strategy
Suppress Ruby's "use RbConfig" instead message

Also make sure that we don't conflate our `Config` with the one Ruby
ships with.
Ugh, remove development `puts`
default model migration to uuid, tz, and deleted_at.
and install timestamps plugin for models, too.
give created_at a default.
Merge pull request #22 from 12-oz/brandur-suppress-rbconfig-message

Suppress Ruby's "use RbConfig" instead message
make created_at not-null.
Merge pull request #23 from 12-oz/default-model-migration

Improve default model migration