chore(version): update the version to rc4

Author: naomiblack

public/docs/js/latest/_data.json

@@ -3,7 +3,7 @@
     "icon": "home",
     "title": "Angular Docs",
     "menuTitle": "Docs Home",
-    "banner": "Welcome to <b>Angular in JavaScript</b>! The current Angular 2 release is <b>rc.3</b>. Please consult the <a href='https://github.com/angular/angular/blob/master/CHANGELOG.md' target='_blank'>  Change Log</a> about recent enhancements, fixes, and breaking changes."
+    "banner": "Welcome to <b>Angular in JavaScript</b>! The current Angular 2 release is <b>rc.4</b>. Please consult the <a href='https://github.com/angular/angular/blob/master/CHANGELOG.md' target='_blank'>  Change Log</a> about recent enhancements, fixes, and breaking changes."
   },
 
   "quickstart": {

public/docs/ts/latest/_data.json

@@ -3,7 +3,7 @@
     "icon": "home",
     "title": "Angular Docs",
     "menuTitle": "Docs Home",
-    "banner": "Welcome to <b>Angular in TypeScript</b>! The current Angular 2 release is <b>rc.3</b>. Please consult the <a href='https://github.com/angular/angular/blob/master/CHANGELOG.md' target='_blank'>  Change Log</a> about recent enhancements, fixes, and breaking changes."
+    "banner": "Welcome to <b>Angular in TypeScript</b>! The current Angular 2 release is <b>rc.4</b>. Please consult the <a href='https://github.com/angular/angular/blob/master/CHANGELOG.md' target='_blank'>  Change Log</a> about recent enhancements, fixes, and breaking changes."
   },
 
   "cli-quickstart": {