Refine project files, fit Cloud Module package versions, and fix forever dependency

## Refine project
I added some lines into the git-ignore file to clean some useless files like debug log

## Fit Cloud Module package versions
Parse indicated that they are using following modules with their version
- Underscore 1.4.2 [Parse SDK Reference](https://www.parse.com/docs/js/symbols/Underscore.html)
- Moment 1.7.2 [Parse SDK Reference](https://www.parse.com/docs/js/symbols/Moment.html)
- Jade 0.28.2 [Parse SDK Reference](https://www.parse.com/docs/js/symbols/Jade.html)
- Express 3.1.0 [Parse SDK Reference](https://www.parse.com/docs/js/symbols/express.html)
- EJS 0.8.3 [Parse SDK Reference](https://www.parse.com/docs/js/symbols/EJS.html)

parse-env should make the same environment as the one provided by Parse.com.

## Forever dependency
Add path of local ```node_modules``` into PATH environment variable to call local `forever` installation
(if user doesn't install parse-env with global option)