Added demo for delayInit option

You didn't actually include a *delayInit* option example although there was a (wrong?) link to debug example.  I made up a table of 3K+ rows and a switch to compare tablesorter with and without *delayInit*. In my Chrome, cache building for this example adds an overhead of ~500 ms. Things are worse in old IEs, which is the reason why I looked into *delayInit* in first place. This example can also be used to test some options that influence performance, e.g. automatic type detection.