Implements OPTIONS http verb for root path

close #294

app/controllers/home_controller.rb

@@ -1,6 +1,14 @@
 class HomeController < ApplicationController
+  before_filter :respond_to_options
+
   def index
     @today = Date.current
     @current = Conference.where("end_date >= ?", @today).order("start_date ASC")
   end
+
+  def respond_to_options
+    respond_to do |format|
+      format.html { head :ok }
+    end if request.options?
+  end
 end