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

[fuddl]

Made a quick mockup.

this is what it looks on mobile:
![mobile](https://cloud.githubusercontent.com/assets/842548/5166378/aa6ec460-73ef-11e4-8785-e8c6dcbf8d96.png)

this is what it looks on desktop:
![desktop](https://cloud.githubusercontent.com/assets/842548/5166379/aa895c62-73ef-11e4-9966-e1f264d5252a.png)


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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/844#issuecomment-64201960
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