[openstreetmap-website] Add right click menu. (#251)

[neiljp]

If a regular menu, the ctrl-right-click *could* be indicated at the bottom (ie. where people don't look as much, and requiring further movement).

Re content of the menu, the graphhopper routing menu from right-click is perhaps pertinent?

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https://github.com/openstreetmap/openstreetmap-website/issues/251#issuecomment-128057105
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