Fix for browser type checking when undefined or null
Fix for browser type checking when undefined or null

When a browser called getType on an undefined or null value it returns
“DOMWindow” instead of “[object Undefined]” (in some cases at least).
Let’s treat undefined and null special and simply return them as
“undefined” and “null”, respectively.

KrisSiegel/msngr.js,KrisSiegel/msngr.js