Fix creating new file via web editor

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
Update gitlab-shell to v2.0.1.
Update guides to use gitlab-shell 2.0.1.
Update changelog for 7.3.2
Version 7.3.2.
Merge remote-tracking branch 'upstream/7-3-stable' into 7-3-stable-nuecho