Add serialization in support of saving models.
Add support for insert and updates.
Refactor Attr's responsibilities.
Add primary keys to ORM models.
Rough in saving.
Remove getDefault from the public interface.
Clean up null-cases on fields.
First pass at saving.
Update deps.
Install composer binary.
Giant diff.

 - Bring in mismatch-db.
 - Refactor mapping.
Merge branch 'master' of github.drwrf:drwrf/mismatch

Conflicts:
	composer.phar