correct $resource's success callback execution

succcess callbacks should be executed for status codes in the range
of <200,300).

Author: IgorMinar

src/Resource.js

@@ -96,7 +96,7 @@ ResourceFactory.prototype = {
           route.url(extend({}, action.params || {}, extractParams(data), params)),
           data,
           function(status, response, clear) {
-            if (status == 200) {
+            if (200 <= status && status < 300) {
               if (response) {
                 if (action.isArray) {
                   value.length = 0;

test/ResourceSpec.js

@@ -139,13 +139,20 @@ describe("resource", function() {
     expect(log).toEqual('cb;');
   });
 
-  it('should delete resource', function(){
-    xhr.expectDELETE("/CreditCard/123").respond({});
+  it('should delete resource and call callback', function(){
+    xhr.expectDELETE("/CreditCard/123").respond(200, {});
 
     CreditCard.remove({id:123}, callback);
     expect(callback).wasNotCalled();
     xhr.flush();
     nakedExpect(callback.mostRecentCall.args).toEqual([{}]);
+
+    callback.reset();
+    xhr.expectDELETE("/CreditCard/333").respond(204, null);
+    CreditCard.remove({id:333}, callback);
+    expect(callback).wasNotCalled();
+    xhr.flush();
+    nakedExpect(callback.mostRecentCall.args).toEqual([{}]);
   });
 
   it('should post charge verb', function(){