After a little bit of checking I decided on the JSignature library as it was very simple to set up and offered the feature to save the strokes in a text field making it very simple to save and reload as well as scale without having to handle a image object. I did a quiick demo of how it works. XML https://gist.github.com/anonymous/11183218 for a demo that requires a long text field on the Contact object and a static resource uploaded to SF. 
It works on iPad and in Salesforce1. However I have not been able to do a Skuid Mobile version since I don’t know how to replace the $(document).ready(function() to init the custom component in Skuid mobile. A guide/tutorial on this would be helpful
