fix(ngResource): Remove request body from $delete

Prevent the  obj.$delete instance method from sending the resource as the request body.  This commit uses the existing hasBody boolean to only set httpConfig.data for methods which should have a request body.

Closes #4280

src/ngResource/resource.js

@@ -466,7 +466,7 @@ angular.module('ngResource', ['ng']).
             }
           });
 
-          httpConfig.data = data;
+          if (hasBody) httpConfig.data = data;
           route.setUrlParams(httpConfig, extend({}, extractParams(data, action.params || {}), params), action.url);
 
           var promise = $http(httpConfig).then(function(response) {

test/ngResource/resourceSpec.js

@@ -32,6 +32,16 @@ describe("resource", function() {
   });
 
 
+  it('should not include a request body when calling $delete', function() {
+    $httpBackend.expect('DELETE', '/fooresource', null).respond({});
+    var Resource = $resource('/fooresource');
+    var resource = new Resource({ foo: 'bar' });
+
+    resource.$delete();
+    $httpBackend.flush();
+  });
+
+
   it("should build resource", function() {
     expect(typeof CreditCard).toBe('function');
     expect(typeof CreditCard.get).toBe('function');