Patched UsersHelper#user_settings_tabs to add a new Rates tab

* Wrapped UsersHelper#user_settings_tabs with an alias_method_chain
* Added the new Rate element to the return of user_settings_tabs
* Added RSpecs to confirm the change works without breaking
* Added a partial view for users/rates which will be used by Redmine
  when it renders the user edit panel

  #1913

spec/lib/rate_users_helper_patch_spec.rb

@@ -0,0 +1,38 @@
+require File.dirname(__FILE__) + '/../spec_helper'
+
+class UsersHelperWrapper
+  include UsersHelper
+end
+
+describe UsersHelper, 'user_settings' do
+  it 'should return 3 tabs' do
+    helper = UsersHelperWrapper.new
+    helper.user_settings_tabs.should have(3).things
+    
+  end
+  
+  it 'should include a rate tab at the end' do
+    helper = UsersHelperWrapper.new
+    rate_tab = helper.user_settings_tabs[-1]
+    rate_tab.should_not be_nil
+  end
+
+  describe 'rate tab' do
+    before(:each) do
+      helper = UsersHelperWrapper.new
+      @rate_tab = helper.user_settings_tabs[-1]
+    end
+
+    it 'should have the name of "rates"' do
+      @rate_tab[:name].should eql('rates')
+    end
+
+    it 'should use the rates partial' do
+      @rate_tab[:partial].should eql('users/rates')
+    end
+
+    it 'should use the i18n rates label' do
+      @rate_tab[:label].should eql(:rate_label_rates)
+    end
+  end
+end