-[BUG] fixed forced sync of many-to-many associations (thanks to SirUli)
-[FEATURE] objects are now compatible JSON.stringify. (thanks to grayt0r)
-[FEATURE] When instantiating the sequelize object, you can now pass a function to logging. This allows you to customize the logging behavior. Default is now: console.log (thanks to kenperkins)
-[BUG] The default logging is still console.log but is wrapped after initialization as it crashes node < 0.6.x.
-[FEATURE] postgresql support. (thanks to swoodtke)
