Added routes for sponsors
Updated dashboard with new sponsor routes
Email form keyup -> keydown

Changed keyup to keydown for the email form so that when you select autocompleted email, the color will go green on the keydown of tab
Added sponsor photo to seeds
Schema
Added sponsors#index method
Added sponsors index view
Added sponsors#shoe method
Added sponsors show view
Added sponsors#new method
Added sponsors new view
Added sponsors#create method
Added sponsors#sponsor_params method
Added (Speaker) next to speaker name
Added (Venue) next to venue name
Added sponsors#edit method
Added sponsors edit view
Added sponsors#update method
Added sponsor#destroy method
Added logic for missing sponsor