Updates to make it compatible with current version

Hi there,

- Currently this global variable has been added to the JavaScript snippet:
var MouseStats_Commands = MouseStats_Commands ? MouseStats_Commands : [];
//tracking script here

- Tagging will be done by using the following method:
http://www.mousestats.com/docs/wiki/20/tag-data-playback-heatmaps-form-analytics

- MouseStatsSharedControl can be used to detect if script is loaded or not.

Warm regards