This reverts commit 53176717.

Conflicts:
	Gemfile.lock

Sometimes the output of Allocations.to_hash may contain garbage. See
https://gitlab.com/gitlab-org/allocations/commit/15d3a39f51392013dcf5f88dd21fab31201350ce
for more information.

Closes #13218

gitlab_git 8.1 adds the ability to count the amount of commits between
two references without having to allocate anything but regular
Rugged::Commit objects. This in turn speeds up the process of counting
the number of commits a branch is ahead/behind by about 3.5x.

Currently any spam detected by Akismet by non-members via API will be logged
in a separate table in the admin page.

Closes #5612

Closes https://github.com/gitlabhq/gitlabhq/issues/9265

https://docs.newrelic.com/docs/agents/ruby-agent/frameworks/grape-instrumentation

See https://dev.gitlab.org/gitlab/gitlabhq/issues/2643

Closes #2877

Performance of Gitlab::Git::Repository was improved in merge request
gitlab-org/gitlab_git!62.

Closes #4231

Also sorts them alphabetically, because OCD.

Closes #5908

Bundler keeps re-ordering this particular Gem every time something is
executed using "bundle exec".