Auth by username instead of email

Added username to User table/model

db/migrate/20130525143240_add_username_to_user.rb

@@ -0,0 +1,6 @@
+class AddUsernameToUser < ActiveRecord::Migration
+  def change
+    add_column :users, :username, :string
+    add_index :users, :username, :unique => true
+  end
+end