fix(dependencies): include certain dependencies only when answering yes ...

...to their respective prompts

Optionally included [dev]dependencies:
- socket.io (dependency)
- socketio-jwt (dependency)
- grunt-contrib-coffee (devDependency)
- grunt-contrib-jade (devDependency)
- grunt-contrib-less (devDependency)
- grunt-contrib-sass (devDependency)