Add or updated the Image.

def syncImage(img, current, session):
    """Add or updated the Image."""
    def _img_str(i):
        return "%s - %s" % (i.type, i.description)

    for db_img in current.images:
        img_info = (img.type, img.md5, img.size)
        db_img_info = (db_img.type, db_img.md5, db_img.size)

        if db_img_info == img_info:
            img = None
            break
        elif (db_img.type == img.type and
                db_img.description == img.description):

            if img.md5 != db_img.md5:
                # Update image
                current.images.remove(db_img)
                current.images.append(img)
                session.add(current)
                pout(Fg.green("Updating image") + ": " + _img_str(img))
            img = None
            break

    if img:
        # Add image
        current.images.append(img)
        session.add(current)
        pout(Fg.green("Adding image") + ": " + _img_str(img))