Add the concept of special events to the app

Add actions to Special Events controller and views for each

Add routes, views and controller actions for Special Events

Create basic views for Special Events and seed data for Marathon 2015

Add url_code attribute to special events for display in the show url

Remove special event spec

Add attribute validation to special event model

Add code to special event view to render event-specific partials

Add centered class and apply it to special event show and rego views

Render rego partial in special event rego view