Uses Bower to pull in front-end JS dependencies

Removes references to bootstrap and jquery.

Adds vendor_libraries.coffee and vendor_libraries.styl to the assets folder
to make it straight-forward to include front-end dependencies.

Exposes bootstrap's fonts properly.

Updates icon references to use Bootstrap 3 conventions
Merge pull request #4 from jessho/bower-package-management

Uses Bower to pull in front-end JS dependencies