[openstreetmap-website] note gpx format of a limited use (#457)

[richlv]

notes can be exported to gpx, but the currently used format is of little use - assuming that the primary usecase is for users to upload these to their gps devices and survey the situation.

the problem is in the description tag. an example :
```
  <desc>
    <![CDATA[<div>
  <div class="note-comment" style="margin-top: 5px">
  <div class="note-comment-description" style="font-size: smaller; color: #999999">Created <span title=" 7 August 2013 at 16:37">13 days</span> ago by <a href="http://api.openstreetmap.org/user/extropy">extropy</a></div>
  <div class="note-comment-text">tram stop no more</div>
</div>

</div>
]]>
  </desc>
```
notice how it includes css and other quite useless information for a gpx file.

suggestion : strip it all, only leave in comment, author and timestamp.

for example :
$comment (by $author at $date, $days ago)

reasoning - gps units have limited amount of space for waypoint descriptions, thus we leave the comment as the first entry (the most important), followed by other information

---
Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/457
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