Correction of an error in the destruction of the carousel

Hi it seems that there is a bug when removing event listeners from 'btnGo'

In this case: 
`$.each(o.btnGo, function(i, val) {`
The 'each' method will iterate over a string variable, that contains class names, but not jquery objects..

and
`$(val).unbind('.jc');`
 will produce error.