Adding all WNC views.

Adding the various sliders and sub-views for the Warm/Neutral/Cool lamps.  I'm doing this using Apple's relatively new "nested view controller" or "container view controller" concept, which means some stuff gets more complicated (knowing who's hooked up to whom) but some stuff gets vastly simplified (which UI elements are controlled by which View Controllers).  This stuff compiles and runs, but is not complete.

This checkin shows the WNC view.  The buttons at the bottom of the view change between the warm/neutral/cool sliders and the Kelvin color picker/intensity slider.