[openstreetmap-website] add tooltips for map controls (#421)

[Alex Barth]

Looks like you're going for a stronger style. That's good, the current style is often hard to read:

![screen shot 2013-08-08 at 4 38 15 pm](https://f.cloud.github.com/assets/98233/934391/8a744080-006a-11e3-986e-4393db22e492.png)


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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/421#issuecomment-22354029
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