Build commands do not display live output

Summary

Live output is not provided with each command in yaml file

Steps to reproduce

Any build presents that issue

Actual behavior

If a script runs for several minutes, we expect output of the script to be presented on the web interface live, but it's only displayed when the script exists

Expected behavior

Each line should be output and presented in the build log web UI

Relevant logs and/or screenshots

n/a

Environment description

Gitlab CE running on Linux gitlab-ci-multi-runner running on Mac OS X

Used GitLab Runner version

Version: 1.7.0-rc.1 Git revision: 8f8cbc34 Git branch: master GO version: go1.7.1 Built: Mon, 26 Sep 2016 17:02:50 +0000 OS/Arch: darwin/amd64