fix for https://github.com/brinley/jSignature/issues/10

[dvdotsenko]

Now it renders the imported image a la v.1

stop by the Demo page (http://willowsystems.github.com/jSignature/#/demo/) open a console and do this:

var s = $('#signature')
var d = s.jSignature('getData')

s.jSignature('clear')
s.jSignature('importData',d)