new variation of demos: ability to dynamically append new data

* the script (jQuery plugin) does NOT currently support the usage pattern:
  - initialize table with plugin
  - update table, adding new rows
  - reinitialize table with plugin

* this commit adds another variation of the demos,
  which illustrates how the script CURRENTLY behaves
  when data is dynamically added to a table
  that has already been initialized by the plugin

* the next commit will update the script,
  giving it the ability to detect this usage pattern,
  and reinitialize the table accordingly.

* the demos introduced in this commit will work after the next commit.
  the demos are being pushed first, to allow a functional comparison.