[openstreetmap-website] allow markdown in changeset comments (#844)

[fuddl]

[Yes I did](http://www.openstreetmap.org/changeset/25086525)

I don't see the problem since images could be simply shrinked like in the [user's diaries](http://www.openstreetmap.org/diary):

```css
.richtext img, .prose img {
  padding: 20px;
  background-color: #f4f4ff;
  display: block;
  max-width: 100%;
  margin: auto;
}

p>img {
  width: auto;
  max-width: 100%;
}
```

---
Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/844#issuecomment-64187021
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