revision 9e57b1401e6113df0acc3ec1544c6870bdb1fc64
2015-11-13:
It doesn't render the html-im part at all. It just renders the plain body.
2015-11: Only images with data: src attributes are rendered, no external ones
2017-06-22: Psi 1.0.9 has a "Image Preview Plugin" that shows a preview of image URLs
