Added simple interactive test page

Added simple interactive demo with nice pathological test data. Also
demonstrates use of code in non-extension.
Optimization of edit1

Bandersnatch would routinely take 9.5s (on a 2012 Mac Pro) to find no
suggestions. Jabberwock would take 5s. By removing a bunch of
unnecessary subarrays, only looping once immediately achieved 10x
performance improvement.