sdepold/sequelize — pull request #406 by watson (2013-01-10 20:52:28+00:00)
Title: Use ES5 native instead of Underscore.js when possible

Since this will always be running in a Node.js environment we can use some of the ECMAScript 5 optimized functions.

The following Underscore.js calls have been swapped for native ES5:
```
Utils._.keys => Object.keys
Utils._.isArray => Array.isArray
```