Install gems into vendor/bundle

Jacob Vosmaerrequested to merge
bundle-vendor into master

This is needed for (some) source installations.

When ruby is installed by root in /usr/local/bin (as our installation guide recommends), then normal bundle install fails because it tries to install gems into /usr/local. This change tells bundler to install the gems in vendor/bundle.

Edited by GitLab Release Tools Bot

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