Support multiple additional libraries

[igorsantos07]

Would be useful to be able to install automatically some dependencies I could find useful for my application, such as:

• jQueryUI or other UI tools
• Less, Bootstrap could be optional (or offer other options)
• Jasmine or QUnit for testing
• Underscore or LoDash for additional functional programming tools
• Handlebars, Emblem.js or Jade for templating (can Jade be used with Ember?)
• CommonJS or RequireJS for modularization

[alexferreira]

the commonjs is already in use

[alexferreira]

underscore was adding to the project