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

[fuddl]

while links (without link text) become ridiculously long 😜

![link is too long](https://cloud.githubusercontent.com/assets/842548/5164938/0be92ae4-73de-11e4-80aa-cae1f27589cb.png)


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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/844#issuecomment-64187577
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