Implement consistent admin interface

* Consistent route/model/controller/view layout
* Get rid of unused photos, speakers, dietchoices, social_events controllers
* Drop unused :public from Rooms and :description from CallForPapers

app/controllers/admin/call_for_papers_controller.rb

@@ -0,0 +1,60 @@
+module Admin
+  class CallForPapersController < Admin::BaseController
+    load_and_authorize_resource :conference, find_by: :short_title
+    load_and_authorize_resource through: :conference, singleton: true
+
+    def show; end
+
+    def new
+      @call_for_paper = @conference.build_call_for_paper
+    end
+
+    def edit; end
+
+    def create
+      @call_for_paper = @conference.build_call_for_paper(call_for_paper_params)
+
+      if @call_for_paper.save
+        redirect_to admin_conference_call_for_paper_path,
+                    notice: 'Call for papers successfully created.'
+      else
+        flash[:alert] = "Creating the call for papers failed. #{@call_for_paper.errors.full_messages.join('. ')}."
+        render :new
+      end
+    end
+
+    def update
+      authorize! :update, @conference.call_for_paper
+      @cfp = @conference.call_for_paper
+      @cfp.assign_attributes(params[:call_for_paper])
+      send_mail_on_schedule_public = @cfp.notify_on_schedule_public?
+
+      send_mail_on_cfp_dates_updates = @cfp.notify_on_cfp_date_update?
+
+      if @cfp.update_attributes(params[:call_for_paper])
+        Mailbot.delay.send_on_call_for_papers_dates_updates(@conference) if send_mail_on_cfp_dates_updates
+        Mailbot.delay.send_on_schedule_public(@conference) if send_mail_on_schedule_public
+        redirect_to(admin_conference_call_for_paper_path(@conference.short_title),
+                    notice: 'Call for papers successfully updated.')
+      else
+        flash[:alert] = "Updating call for papers failed. #{@cfp.errors.to_a.join('. ')}."
+        render :new
+      end
+    end
+
+    def destroy
+      if @call_for_paper.destroy
+        redirect_to admin_conference_call_for_paper_path, notice: 'Call for Papers was successfully deleted.'
+      else
+        redirect_to admin_conference_call_for_paper_path, alert: 'A error prohibited this Call for Papers from being destroyed: '\
+        "#{@call_for_paper.errors.full_messages.join('. ')}."
+      end
+    end
+
+    private
+
+    def call_for_paper_params
+      params[:call_for_paper]
+    end
+  end
+end