adds booth backend for index, show, create and edit actions

app/models/abilities/administrator.rb

@@ -40,12 +40,13 @@ module Abilities
       can [:search, :create, :index, :destroy], ::Manager
       can [:search, :create, :index, :destroy], ::Poll::Officer
 
-      can [:manage], Poll
-
       can :manage, Annotation
 
       can [:read, :update, :destroy, :summary], SpendingProposal
       can [:search, :edit, :update, :create, :index, :destroy], Banner
+
+      can [:manage], Poll
+      can [:manage], Poll::Booth
     end
   end
 end

app/models/poll/booth.rb

@@ -2,5 +2,7 @@ class Poll
   class Booth < ActiveRecord::Base
     belongs_to :poll
     has_many :voters
+
+    validates :name, presence: true
   end
 end