Deprecation guide for Ember.create and Ember.keys

- Adds links out to MDN for more information.

See emberjs#2256

source/deprecations/v1.x.html.md

@@ -443,6 +443,18 @@ For further reading, review the [RFC](https://github.com/emberjs/rfcs/blob/maste
 Ember.js 1.13 is the last minor release of Ember 1.x before 2.0. Consequently,
 it has a rather large number of notable deprecations.
 
+#### Ember.create
+
+`Ember.create` is deprecated in favor for `Object.create`. For more information
+regarding `Object.create`, please
+[read the MDN doc](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/create).
+
+#### Ember.keys
+
+`Ember.keys` is deprecated in favor for `Object.keys`. For more information
+regarding `Object.keys`, please
+[read the MDN doc](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/keys).
+
 #### Ember.View
 
 Ember 1.x encouraged a Model-View-Controller-Route architecture. Since then,
@@ -1022,4 +1034,4 @@ c = Contact.create({ firstName: "John", lastName: "Doe" });
 c.swapNames();  // returns c
 Object.freeze(c);
 c.swapNames();  // EXCEPTION
-```
+```