Add dependencies
Add sequelize storage
Update readme for sequelize storage
Remove timestamp from model defaults

(it defaults to `true` anyway)
Support Sequelize 1.7.10
Add tests that explicitly assert table is created

This partially reverts commit 3fc1f0393ea47e1e8d8e32555a0cffed6f9f918f.
Merge branch 'sequelize-storage' of github.com:rpaterson/migrator into rpaterson-sequelize-storage

Conflicts:
	README.md
Default migration model to a single column