feat(core): introduce $body service

This patch makes it easier to gain access to document.body
via the injector.

Author: matsko

angularFiles.js

@@ -15,6 +15,7 @@ var angularFiles = {
     'src/ng/anchorScroll.js',
     'src/ng/animate.js',
     'src/ng/asyncCallback.js',
+    'src/ng/body.js',
     'src/ng/browser.js',
     'src/ng/cacheFactory.js',
     'src/ng/compile.js',

src/AngularPublic.js

@@ -59,6 +59,7 @@
   $AnimateProvider,
   $$CoreAnimateQueueProvider,
   $$CoreAnimateRunnerProvider,
+  $BodyProvider,
   $BrowserProvider,
   $CacheFactoryProvider,
   $ControllerProvider,
@@ -221,6 +222,7 @@ function publishExternalAPI(angular) {
         $animate: $AnimateProvider,
         $$animateQueue: $$CoreAnimateQueueProvider,
         $$AnimateRunner: $$CoreAnimateRunnerProvider,
+        $body: $BodyProvider,
         $browser: $BrowserProvider,
         $cacheFactory: $CacheFactoryProvider,
         $controller: $ControllerProvider,

src/ng/body.js

@@ -0,0 +1,15 @@
+'use strict';
+
+/**
+ * @ngdoc service
+ * @name $body
+ * @requires $document
+ *
+ * @description
+ * A {@link angular.element jQuery or jqLite} wrapper for the browser's `document.body` object.
+ */
+function $BodyProvider() {
+  this.$get = ['$document', function($document) {
+    return jqLite($document[0].body);
+  }];
+}

test/ng/bodySpec.js

@@ -0,0 +1,7 @@
+'use strict';
+
+describe('$body', function() {
+  it("should inject $document", inject(function($body, $document) {
+    expect($body).toEqual(jqLite($document[0].body));
+  }));
+});