closurified numeric, closurified buttonTests.html and a little cleanup on imageTests.html
minor changes
Updated KeelingCurve to use brixlib (still w/ non-closure NumericQuestion, SelectGroup and Slider)
Updated HTML files use Closure Lib
closurify selectgroup and numericquestion
oops. missed a couple of things
captioned image was incorrectly setting its id property.

There were 2 problems.

* Since there are no private properties, if the base class sets it, the derived class needs to be careful when using the property, in this case the id property belongs to the base Image class and the CaptionedImage needs to create a new property captioned_id.
* It was using the undefined config.id instead of this.captioned_id to set the id property in the config passed to its base class.
closurified slider bric (added the jquery externs file to the build to support slider's current implementation)
Updated HTML files using Closure lib
Updated HTML with Closure (and some TOC updates)
The default for the EventManager ctor publishToBroker arg should be false
fix ref's in unit tests to match new namespaces by creating aliases

still issues to be fixed.