add support for user name changes

db/migrate/20130326035904_create_user_name_change_requests.rb

@@ -0,0 +1,21 @@
+class CreateUserNameChangeRequests < ActiveRecord::Migration
+  def up
+    create_table :user_name_change_requests do |t|
+      t.string :status, :null => false, :default => "pending"
+      t.integer :user_id, :null => false
+      t.integer :approver_id
+      t.string :original_name
+      t.string :desired_name
+      t.text :change_reason
+      t.text :rejection_reason
+      t.timestamps
+    end
+    
+    add_index :user_name_change_requests, :user_id
+    add_index :user_name_change_requests, :original_name
+  end
+
+  def down
+    drop_table :user_name_change_requests
+  end
+end