Fix bad select_related call. In Django 1.8, select_related now throws an error if you give it an invalid field. This was happening. Fix that query. Also noticed an extra query generated in the display_post template. Fixed.

.user_photo {
   margin: 1em;
   display: inline-block;
}
.owner_photo {
   border: 1px solid gray;
}
.owner_photo img {
   margin: auto;
   width: 100%;
}
hr.footer_divider {
   margin-top: 1.5em;
}