Add images to posts

This is my idea for images in talks; we just take the user profile pictures and put them next to the title.
![screen shot 2013-10-04 at 12 17 25 pm](https://f.cloud.github.com/assets/358992/1268456/9d459c08-2cdf-11e3-9b4f-4b202663410a.png)

However I'm not sure about the implementation (you can't see the CSS here as I already commited it to gh-pages in 2b9139fbbd97552d74a0dba3e7b54653305165df). Here is the CSS-Code:

```css
img{
  float: left;
  border-radius: 25px;
  margin-left: -65px;
  width: 50px;
  height: 50px;
}
```

So I'm basically giving the image a negative margin to put it on the left.