Puma support

Created by: denji

• Patches below has few improvements to the gitlab check and "task_helper"

• Support puma_worker_killer|puma_auto_tune to kill a memory leak in the Puma worker

• Support for gitlab-workhorse HTTP (git-pack-objects)

• Install Gem without Unicorn

  # Production ready flags (protected overflow/exploit)
  bundle config build "-O2 -pipe -march=native -fstack-protector-strong \
                                    --param=ssp-buffer-size=4 -w"
  
  bundle install --without development test [mysql|postgres] unicorn \
                 --path vendor/bundle --no-deployment

• Rake scripts to verify whether init script was installed on FreeBSD lib/support/rc.d/gitlab(puma);lib/support/rc.d/gitlab-unicorn and LaunchDaemons