Moved metadata database migrations from configuration to Python module namespace.

Gruntfile.js

doc/sphinx/_doclib/upgrading.rst

lib/hawat/app.py

lib/hawat/blueprints/auth_pwd/__init__.py

lib/hawat/blueprints/auth_pwd/forms.py

lib/hawat/blueprints/auth_pwd/templates/auth_pwd/login.html

lib/hawat/config.py

lib/hawat/const.py

lib/hawat/migrations/README

lib/hawat/migrations/alembic.ini

lib/hawat/migrations/env.py

lib/hawat/migrations/script.py.mako

lib/hawat/migrations/versions/.gitplaceholder

lib/hawat/migrations/versions/09e0bd80ffe8_added_apikey.py

...ations/versions/13b6099bbeee_added_max_attachment_size.py

lib/hawat/migrations/versions/4a463e591040_dropped_handle.py

scripts/sqldb-migrate.py

scripts/sqldb-migrate.sh