[openstreetmap-website] Redesign notes permalink. (#238)

[Tom MacWright]

This adds a small permalink icon to the sprite and updates the CSS for
the permalink.

![](http://dl.dropbox.com/u/68059/Screenshots/yk9~_c0ww~_z.png)
You can merge this Pull Request by running:

  git pull https://github.com/osmlab/openstreetmap-website notes-permalink

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

  https://github.com/openstreetmap/openstreetmap-website/pull/238

-- Commit Summary --

  * Redesign notes permalink.

-- File Changes --

    M app/assets/images/sprite.png (0)
    M app/assets/images/sprite.svg (20)
    M app/assets/javascripts/templates/notes/show.jst.ejs (3)
    M app/assets/stylesheets/common.css.scss (5)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/238.patch
https://github.com/openstreetmap/openstreetmap-website/pull/238.diff

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