Move away from bower.

[GCheung55]

Ember is moving to a non-bower world.

• Update blueprint to install foundation-sites from npm.
• Update index.js to reference the foundation-sites in node_modules.
• Add backwards compat.

I think installing foundation-sites bower also adds what-input and jquery automatically, and it looks like those deps are listed in foundation-sites package.json as well. I'm not sure whether they will need to be loaded or not though.

[acoustep]

Agreed, I think this would be a good move.