Use bower?

[sibsfinx]

Hi, thanks for this great gem. It seems we can move some front-end related gems to bower to prevent versions conflicts and separate front-end packages from backend ones:

• bootstrap-sass
• font-awesome-sass
• jquery-rails
• jquery-ui-rails
• codemirror-rails

Also, we can plug libs as bower components:

• chosen

Pros:

• easy to add and update front-end packages
• no chance to modify libs (some guys do, you know)
• reduce gem versions confilcts

Cons:

• bower as nodejs dependency (needed for development and deploy)

I've started in my fork https://github.com/CultivateLabs/storytime/compare/master...sibsfinx:sib/chore/add-bower?expand=1