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

init.rb

@@ -1,5 +1,7 @@
 require 'redmine'
 
+require 'rate_users_helper_patch'
+
 Redmine::Plugin.register :redmine_rate do
   name 'Rate Plugin'
   author 'Eric Davis'