UI updates to improve UX

Added ability to hide columns and added helper text.

Mailers, Feature specs, and Pagination, oh my!

Added back pagination for all pages, added sendgrid for mailers, and feature specs.

Departments have been added!

This is a breaking change! Added departments and also added scrapers for both UoP and PSU, so there is now actual data in prod. Also added an actual UUID to users. Also adds average grades to courses and schools.

Average ratings to classes and schools

• switches from will_paginate to kaminari
• adds average ratings to classes and schools
• allows filtering and sorting by those average ratings

added filtering and sorting

Used the filteriffic gem to add filtering and sorting to all the tables.

Initial release

MVP is done!