Bump to v4.7.0.

_Stack.js

@@ -18,7 +18,7 @@ define(['./_stackClear', './_stackDelete', './_stackGet', './_stackHas', './_sta
     }
   }
 
-  // Add functions to the `Stack` cache.
+  // Add methods to `Stack`.
   Stack.prototype.clear = stackClear;
   Stack.prototype['delete'] = stackDelete;
   Stack.prototype.get = stackGet;