Dom el for content, onClick now receives alert as param, and image popup shrinks to fit image if necessary

1. Accepts dom element for content (it'll grab the html automatically)
2. Button onClick method now receives 3 params e, btn, alert (so you can quickly alert.closeAlert())
3. When you open an image alert using the image param, it will now shrink the popup to fit the image size if it's smaller and disables alert padding