Fetch current .ruby_version for gitlab-ce master

Toon Claesrequested to merge
tc-ruby-2.4.5 into master

When building the docker image, download .ruby_version from gitlab-ce master on gitlab.com.

This way we try to ensure we always use the Ruby version as defined in gitlab-ce.

Ruby version was recently updated to 2.4.5 (https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/22484) and will soon be updated to 2.5.3 (https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/22555).

Closes #407 (closed)

Edited by Toon Claes

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