[openstreetmap-website] Add X-UA-Compatible meta tag (#529)

[John Firebaugh]

Rails 4 removed the `BestStandardsSupport` middleware, because supposedly a HTML5 doctype accomplishes the same thing. But not quite -- without X-UA-Compatible, the UI for changing compatibility mode is still visible, and users can get themselves into a bad state (see https://github.com/openstreetmap/openstreetmap-website/pull/498#issuecomment-28483550)
You can merge this Pull Request by running:

  git pull https://github.com/jfirebaugh/openstreetmap-website X-UA-Compatible

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

  https://github.com/openstreetmap/openstreetmap-website/pull/529

-- Commit Summary --

  * Add X-UA-Compatible meta tag

-- File Changes --

    M app/views/layouts/_head.html.erb (1)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/529.patch
https://github.com/openstreetmap/openstreetmap-website/pull/529.diff
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