Added jQuery Tocify Plugin

Hey guys,

I would like to add my jQuery plugin, [Tocify](https://github.com/gfranko/jquery.tocify.js).  The latest version (that I added) is v1.7.0 and all source files can be found here: https://github.com/gfranko/jquery.tocify.js/tree/v1.7.0/src.

Let me know if you need anything else!

Greg