[openstreetmap-website] Implemented right-click context menu (#1030)

[danstowell]

Here's a context menu implemented for the main map view. Fixes #251. I think a context-menu click is a nice way to interact with the (relatively new) directions and query-here tools.

The exact choice of items is a matter that can be debated, but that aside, I'd like to ask if this approach seems broadly acceptable.

Notes:
* The browser's built-in context menu remains accessible, by holding shift while right-clicking.
* The "Add note here" option adds it in not-quite the right place, unless you also merge #1028 in which case it works correctly.
* I haven't yet done the i18n - wanted to get dev feedback before I do that.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/1030

-- Commit Summary --

  * Import leaflet.contextmenu source files
  * Implement context menu with: directions, add note, describe, centre.
  * Add "Query features" to context menu
  * Allow users to get default contextmenu on shift-click
  * Enable/disable some context-menu options conditional on zoom
  * tidier code

-- File Changes --

    M app/assets/javascripts/index.js (83)
    A app/assets/javascripts/leaflet.contextmenu.js (7)
    M app/assets/stylesheets/leaflet-all.scss (1)
    A app/assets/stylesheets/leaflet.contextmenu.css (54)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/1030.patch
https://github.com/openstreetmap/openstreetmap-website/pull/1030.diff

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/1030
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