Project.with_builds_enabled.find_by(runners_token: TOKEN) is not working with project created since upgrade to gitlab v11.11.

From gitlab 8.12 there is new CI job permissions model which only accept login
from ci token for running job. Then the access is revoked after the job is finished.
In Nexedi, when have a lot of URLs which rely on gitlab-ci-token and project-runners-token, so
we need to re-allow access else access to all those URL will be refused.

More info are here: https://docs.gitlab.com/ee/user/project/new_ci_build_permissions_model.html#before-gitlab-8-12

ICPs should be listed in a string serapared by space

TODO detect whether request comes from China and only then show ICP (?).

We show in small font size the same info that is shown on sign_in page:

    "GitLab Nexedi Edition", "About GitLab" and "About Nexedi"

This is good to have and hereby-introduced about-footer area will be
also used in the next patch for ICP too.

XXX placement of .about-footer to be near bottom is done not very
correctly.

= GitLab Community Edition + Nexedi patches

Include Merge description message in merge by default. User can disable description in merge message by clicking on `Don't include description in commit message`.

Drop the merge title which is "Merge branch SOURCE into TARGET" and only keep the MR title as commit message.

mimemagic was yanked from rubygems, so this cause gitlab to fail building. To
make it possible to keep installing this old version of gitlab we get mimemagic
from git.

[ci skip]

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