chore(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,
+  $$BodyProvider,
   $BrowserProvider,
   $CacheFactoryProvider,
   $ControllerProvider,
@@ -220,6 +221,7 @@ function publishExternalAPI(angular) {
         $animate: $AnimateProvider,
         $$animateQueue: $$CoreAnimateQueueProvider,
         $$AnimateRunner: $$CoreAnimateRunnerProvider,
+        $$body: $$BodyProvider,
         $browser: $BrowserProvider,
         $cacheFactory: $CacheFactoryProvider,
         $controller: $ControllerProvider,

src/ng/body.js

@@ -0,0 +1,7 @@
+'use strict';
+
+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));
+  }));
+});