Vertically align the menu

This PR visually vertically aligns the menu buttons. However, it also normalizes the `env` variable to fall back to `"dev"` if there is none defined (or it happens to be defined as `"development"`).

Smaller changes include:
- adding __npm-debug.log__ to the ignored files.
- removing white space in empty lines
- locking `jade` into version `~1.5.0`
- fixing a breaking change in the `index.jade` for new jade version