Implements OPTIONS http verb for root path

close #294

spec/controllers/home_controller_spec.rb

@@ -0,0 +1,32 @@
+require 'spec_helper'
+
+describe HomeController do
+  let(:conference) { create(:conference) }
+  describe 'GET #index' do
+    it 'Response code is 200' do
+      get :index
+      expect(response.response_code).to eq(200)
+    end
+
+    it 'Assigns conference' do
+      get :index
+      expect(assigns(:current)).to eq [conference]
+    end
+
+    it 'Assigns only pending conferences' do
+      create(:conference,
+             end_date: Date.today - 7,
+             start_date: Date.today - 14)
+      get :index
+      expect(assigns(:current)).to eq [conference]
+    end
+
+  end
+
+  describe 'OPTIONS #index' do
+    it 'Response code is 200' do
+      process :index, 'OPTIONS'
+      expect(response.response_code).to eq(200)
+    end
+  end
+end