New migration file (but still relying on .sync)
See https://github.com/18F/afsmallbiz/issues/78
Do not drop SequelizeMeta table, it's needed for migrations
bulk of most tables defined
still struggling with foreign keys
experimenting with allowing sequelize to create many-to-many join table itself
migrated and synched versions of database consistent
see https://github.com/18F/afsmallbiz/issues/78
(except for lack of foreign keys to join table in synched version, which seems unavoidable)
Add db setup to .travis.yml
Merge branch 'master' into migrations

Conflicts:
	lib/controllers/documents.js
Merge pull request #8 from 18F/migrations

Using Sequelize migrations to manage data schema.  Looks good.