updatesrc on image change

Thanks for the catch @kickbk, actually src was not listened. The fix will be available in the next release

Hi @artf This is not working in the current demo (neither on my side). If you change any image and reload the page, the image goes to it's previous src.

It's not working the first time you load a template. If you add new images in the current canvas, the src listener works as expected.

I have been debugging it for some hours, but all the ideas were unsuccessful :(

I had to solve this using a workaround and it seems like a good solution at the moment. I have created my own localstorage and I'm saving the template on $(window).on('unload... and loading it again on $(window).on('load'