Changed UI for student menu page and added necessary bootstrap support

In addition to making the UI look better for the student menu page, I had to do the following to make this work (copied from a stackoverflow.com page):

Copy: bootstrap/dist/css/bootstrap.css and bootstrap/dist/css/bootstrap.min.css
To: vendor/assets/stylesheets

Copy: bootstrap/dist/js/bootstrap.js and bootstrap/dist/js/bootstrap.min.js
To: vendor/assets/javascripts

Update: app/assets/stylesheets/application.css by adding:
*= require bootstrap.min

Update: app/assets/javascripts/application.jsby adding:
//= require bootstrap.min