[openstreetmap-website] Update CONFIGURE.md for Rails 4 (#525)

[John Firebaugh]

Rails 4 doesn't support or require a :without_protection => true option.
You can merge this Pull Request by running:

  git pull https://github.com/jfirebaugh/openstreetmap-website patch-1

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

  https://github.com/openstreetmap/openstreetmap-website/pull/525

-- Commit Summary --

  * Update CONFIGURE.md for Rails 4

-- File Changes --

    M CONFIGURE.md (4)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/525.patch
https://github.com/openstreetmap/openstreetmap-website/pull/525.diff
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