fix($resource): HTTP method should be case-insensitive

Perform call `angular.uppercase` on all given action methods.

Closes #1403

src/ngResource/resource.js

@@ -325,6 +325,7 @@ angular.module('ngResource', ['ng']).
       }
 
       forEach(actions, function(action, name) {
+        action.method = angular.uppercase(action.method);
         var hasBody = action.method == 'POST' || action.method == 'PUT' || action.method == 'PATCH';
         Resource[name] = function(a1, a2, a3, a4) {
           var params = {};

test/ngResource/resourceSpec.js

@@ -9,7 +9,7 @@ describe("resource", function() {
     $resource = $injector.get('$resource');
     CreditCard = $resource('/CreditCard/:id:verb', {id:'@id.key'}, {
       charge:{
-        method:'POST',
+        method:'post',
         params:{verb:'!charge'}
       },
       patch: {