Add cache busting to module images

[grandeljay]

When you update/change an image in your module, the browser will still show a cached version.

Steps to reproduce

1. Save an image in your module under /images/Image1.jpg
2. Release/update the module
3. Replace the image at /images/Image1.jpg with a new/updated image.
4. The old image will still show

I think it would be smart, if the MMLC would link the module images with a hash of the image so the browser is forced to download it again if it changes.