GRN-11: Ability to configure room specific settings (#348)

* Added the ability to set room settings on create or update

* Added room settings alerts and made fixes to other alerts

* Small bug fixes related to rubocop and the create room modal

* Update test case and fixed issue with small edge case

* Update room.js

db/migrate/20190122210632_add_room_settings_to_room.rb

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+class AddRoomSettingsToRoom < ActiveRecord::Migration[5.0]
+  def change
+    add_column :rooms, :room_settings, :string, default: "{ }"
+  end
+end