Add provider.$decorator to angular.Module

Allow for decorators to be added prior to the angular.config process.

Use case: I am working on a project using ui.router and would like to modify the $stateProvide.state service and would like to ensure that my modification will always be applied prior to any angular.config blocks which could contain $stateProvide.state requests.

This would also allow any decorators to be clearly delineated in your code and not lost in a config block.

Author: RodneyEbanks

src/loader.js

@@ -192,6 +192,18 @@ function setupModuleLoader(window) {
            * See {@link auto.$provide#constant $provide.constant()}.
            */
           constant: invokeLater('$provide', 'constant', 'unshift'),
+          
+          /**
+           * @ngdoc method
+           * @name angular.Module#decorator
+           * @module ng
+           * @param {string} name service name
+           * @param {Function} providerType Construction function for creating new instance of the
+           *                                service.
+           * @description
+           * See {@link auto.$provide#decorator $provide.decorator()}.
+           */
+          decorator: invokeLater('$provide', 'decorator'),
 
           /**
            * @ngdoc method