Cleaning unneeded stuff

Don't merge yet, doing the pull now for testing and some question proposes.

On https://github.com/sequelize/sequelize/blob/master/test/dao/values.test.js most of declared variables aren't needed, should i remove them or comment?

![captura de ecra 2014-04-10 as 15 24 05](https://cloud.githubusercontent.com/assets/3604053/2668793/5490afe0-c0bc-11e3-975b-caa5824d89fc.png)

Examples: dialect, config, uuid and sinon