[openstreetmap-website] Fixed changeset map (#299)

[Saman Bemel-Benrud]

This is a simpler implementation of a fixed-positioned changeset map. Replaces #204.

The way it works: when the page scroll hits the top of the map, we add a class to the map to change it's positioning from absolute to fixed.
You can merge this Pull Request by running:

  git pull https://github.com/samanpwbb/openstreetmap-website fixed-changeset-map

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

  https://github.com/openstreetmap/openstreetmap-website/pull/299

-- Commit Summary --

  * fixing mobile map + other minor mobile adjustments.
  * fix overflow on login page on mobile.
  * Merge branch 'master' of git://github.com/openstreetmap/openstreetmap-website
  * Merge branch 'master' of git://github.com/openstreetmap/openstreetmap-website
  * Merge branch 'master' of git://github.com/openstreetmap/openstreetmap-website
  * Merge branch 'master' of git://github.com/openstreetmap/openstreetmap-website
  * Merge branch 'master' of git://github.com/openstreetmap/openstreetmap-website
  * Merge branch 'master' of git://github.com/openstreetmap/openstreetmap-website
  * fixed position map on changeset page.
  * fixed position changeset map on scroll.

-- File Changes --

    M app/assets/javascripts/changeset.js (8)
    M app/assets/stylesheets/common.css.scss (20)
    M app/views/changeset/list.html.erb (4)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/299.patch
https://github.com/openstreetmap/openstreetmap-website/pull/299.diff

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