[openstreetmap-website] Tooltips for map controls (#434)

[John Firebaugh]

This uses the same CSS for tooltips as iD. The JS is taken from Twitter boostrap -- iD uses a D3-based equivalent.

![image](https://f.cloud.github.com/assets/98601/928323/dc4ed3ce-ffb2-11e2-8646-b46ac9a95bd8.png)
You can merge this Pull Request by running:

  git pull https://github.com/jfirebaugh/openstreetmap-website tooltips

Or you can view, comment on it, or merge it online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/434

-- Commit Summary --

  * Tooltips for map controls

-- File Changes --

    M Vendorfile (4)
    M app/assets/javascripts/application.js (1)
    M app/assets/javascripts/index.js (8)
    M app/assets/javascripts/leaflet.key.js (9)
    M app/assets/javascripts/leaflet.note.js (19)
    M app/assets/stylesheets/common.css.scss (83)
    M config/locales/en.yml (3)
    A vendor/assets/bootstrap/bootstrap.tooltip.js (361)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/434.patch
https://github.com/openstreetmap/openstreetmap-website/pull/434.diff

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