Added routes for agencies
Added agencies#index method
Added agencies index view
Updated dashboard with Agency links
Added agencies#show method
Added agencies show view

Commented out the delete button. Still want to figure out if that's something I want to do given the fact the speakers kind of depend in agencies.
Added agencies#edit method
Added agency_params method
Added agencies edit view
Removed agency photo that was added by mmistake
Removed photo_url from agency_params because it isn't used
Added name field
Added agencies#update method
Added agencies#new method
Added agencies new view
Added agencies#create method
Changed Agency to Agency / Employer
Updated new agency path in the speakers new view
Updated speaker employer link in speakers show view
Updated language in speakers show view to make more sense