##<sign-here>
sign-here is a polymer element that provides smooth signature drawing with HTML5 Canvas by wrapping
the signature_pad library.
Example:
<sign-here width="400" height="200" image="{{image}}"></sign-here>
The image property will be updated after any interaction with the data-uri encoded value of the image.
The encoding method and quality can be controlled, as can the color of the paper and ink.