[openstreetmap-website] Reorganize export/share UI (#351)

[John Firebaugh]

I've implemented a modified version of @samanpwbb's suggestions.

![image](https://f.cloud.github.com/assets/98601/889802/3d37d330-fa26-11e2-8e02-a27a6c1c4545.png)

* "Include marker" stays grouped with Link / HTML because it applies to these methods but not to Image.
* Included "HTML" in the toggle.
* "Link" and "Short Link" are actually link elements and you can do right-click -> copy link location. Therefore a separate link icon is unnecessary.

I'm leaving questions about scale to another PR. This one is almost two weeks in the making and there's already lots of good stuff in it -- let's get it merged.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/351#issuecomment-21896633
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