add node util module

This is based off of the documentation at http://nodejs.org/docs/v0.11.14/api/util.html.
Deprecated APIs mentioned there have been left out for now.
Add HTMLScriptElement declaration
Add crossOrigin property to HTMLScriptElement
change util.inspect options depth to a maybe type
Merge pull request #145 from rsolomo/node-util

add node util module
Merge pull request #192 from Shraymonks/HTMLScriptElement

Add HTMLScriptElement declaration