Internet Explorer 10+ throws errors when moving mouse

[johnbacon]

On the Slideout demo page, moving the mouse in IE10+ throws the following error over and over again:

SCRIPT5007: Unable to get property '0' of undefined or null reference 
slideout, line 186 character 3494 

and highlights the following minified JavaScript as the culprit:

var n=t.touches[0].clientX-e._startOffsetX;

It appears line 193 of the unminified slideout.js is the issue:

var dif_x = eve.touches[0].clientX - self._startOffsetX;

[johnbacon]

This can be "fixed" by checking for the presence of eve.touches where it is referenced. For instance:

if (typeof eve.touches === 'undefined') { return; }

Though I'm sure there's a better way.

[pazguille]

#50