added a shortcode so that this data can be included in wordpress content if needed
updated other readme
Allow user callbacks for update, insert, delete

re Design:#2576
added noedit/hide_columns re Design:#2576
pass modified idxs around to reduce excess updates/inserts

re Design:#2576
Bug fixes and work on default values, create hook to add dbte's on the
fly

 * fixed bugs with hooks not being declared
 * fixed bugs with shortcode dbte's not passing their url to the ajax
   request (which can cause weird results if the dbte debends on that
   url)
allow url params to filter the grid