[openstreetmap-website] Changeset list revamp (#204)

[Saman Bemel-Benrud]

This pull request reworks the changeset list page so the map is fixed and the changesets scroll alongside the map.

Here's a screenshot:
![Screen Shot 2013-01-25 at 5 22 22 PM](https://f.cloud.github.com/assets/108094/99046/921c41dc-6742-11e2-9288-58784f942f60.png)


Addresses issues brought up in https://github.com/openstreetmap/openstreetmap-website/issues/203
You can merge this Pull Request by running:

  git pull https://github.com/samanpwbb/openstreetmap-website changeset-list-revamp

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

  https://github.com/openstreetmap/openstreetmap-website/pull/204

-- 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
  * reworked changeset list layout.

-- File Changes --

    M app/assets/stylesheets/common.css.scss (62)
    M app/assets/stylesheets/small.css.scss (22)
    M app/views/changeset/list.html.erb (12)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/204.patch
https://github.com/openstreetmap/openstreetmap-website/pull/204.diff

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