Starting on small subset of contrib library to ensure that all of the pieces are in order (test infrastructure, docs, mixin decls, etc.  Speed and such will come iteratively.
Vendor test libs in place. Same as Underscore
Adding Underscore as vendor lib for now
Added test.html.  Removed the template test elements and speed test elements (for now).
First passing test, moving on to the remainder
Rewrote _.cat to be more robust in the face of possible arguments objects