jquery .live() replaced by .on() due to deprecation in 1.7 and removal in 1.9

jquery.reveal.js is an old plugin which was created using jQuery 1.4.4. Since ProudCrowd uses 1.7.2 (and is hopefully upgraded to 1.10) it is necessary to replace the usage of .live() with .on().

The tab works in an application using jQuery 1.10+.