dockerfile: switch back to the ubuntu:14.04 base image
dockerfile: install updated git-core from git-core/ppa repo
dockerfile: install ruby2.1 from brightbox/ruby-ng repo
init: start supervisord at startup

supervisord is not really used in this image. But since this image
serves as a base image for runner images, they could really use this
it to launch daemons at boot. Just like the runner-gitlab image needs
to boot the mysql and redis servers.
install: send USR2 signal to stop the runner
install: configure runner to launch as gitlab_ci_runner
init: error out if the runner has not been configured
readme: document available configuration parameters
init: added CI_RUNNERS_COUNT option to allow launching multiple runners
init: update sed expression to configure runners count
init: create builds directory at the ${DATA_DIR}
init: make sure `${DATA_DIR}/.ssh/` is owned by `gitlab_ci_runner` user
init: do not chown `${DATA_DIR}` recursively
install: clean up
readme: added "Contributing" section
readme: added "Reporting Issues" section
dockerfile: upgrade to sameersbn/ubuntu:14.04.20141026 base image
Merge pull request #1 from sameersbn/master

Update fork with source repository