Add bower.json and dependencies

This is roughly equivalent to commit
"0a434d90ea2ab58d728aa5643c21524e5cd1ddd7" in the original Roostagram
repository, which can be found here:

https://github.com/bocoup-education/roost-chicago-2014-app/tree/0a434d90ea2ab58d728aa5643c21524e5cd1ddd7

Again I had to install all the bower packages globally before they would
install in the project, so if you're having problems try that.