feature: Release new wukong gem 4.0.0

Squashed commit of the following:

commit 302fec3921430ba33ef922d1fb722839121dcdb3
Author: Travis Dempsey <travis@infochimps.com>
Date:   Wed Mar 19 16:01:13 2014 -0500

    bump wukong gem

    Change-Id: I16c1828d36ae1c05a5e8f664deba3331652529d3

Change-Id: I06a584e2eab91e7501d8525e469abb0a0bb4cb87