*Mailcloak broken on images

Inset an image in an article content.
Then add a mail adress to the image.
You will get this

![screen shot 2014-07-17 at 10 55 16](https://cloud.githubusercontent.com/assets/869724/3611011/070d03a6-0d95-11e4-8557-795a60eb6b0c.png)
What happens is that the < and > are converted to html entities.
This patch should solve it