fixes #1199

Element.pin is buggy: 
Buggy example: http://jsfiddle.net/2n4Ad/
Fixed example: http://jsfiddle.net/2n4Ad/1

This fixes the documented behaviour.  Tested in IE6, 7, 8 , 11; FF &&
Chrome

There are more parameters/methods in Element.pin. They are not
documented. According to docs, `.pin()` takes just 1 parameter...

fixes #1199