Modify Manager/ModelBase to support multiple database bindings and implement Flask-SQLAlchemy style configuration variables.
Make _compat file a little clearer to read regarding which section block applies to which PY version.

"if not PY2" isn't as clear as "if PY3".
Ignore `signature-differs` warnings in pylint.
Allow `config=None` in `Manager`.
Add tests for multiple database binds in Manager.
Update CHANGES with Manager modifications related to multiple binds.
PEP8 compliance.
Move project metadata to alchy/__meta__.py.
Separate clean commands so that removing virtualenv can be excluded.
Use relative imports for modules inside tests/ folder.
Remove reference to old six dependency.
Update docs with new config values, changes to Manager, and multiple database binds.
Fix errors in quickstart example code.
PEP8 compliance.
Add py34 to tox.
Simplify setup().
Release v0.9.0.