Add group membership api

Change-Id: I3b15ae34c0957a0f4026e1886c92a9770e9d170e

Change-Id: I5b174bba02856ede788dcb51ec9b0d598ea7d0df

* show highlights when replace empty line with content
* show inline diff when replace line with spaces with content

Authenticate or create users from OAuth providers

Add 'notes' to path blacklist, fixes #4967

Update installation docs to use v1.7.1 of gitlab-shell

Rewrote init script.

Create satellites during update to 6.0. Fix #4938

add missing comma(s) in api examples

have email views use iid

Satellites for projects that were located in the root namespace needs to be recreated once they've been migrated to the creator’s namespace during the upgrade process.

This can be achieved by running the sudo -u git -H bundle exec rake gitlab:satellites:create RAILS_ENV=production during the update process.

The command has been added to the 5.4 to 6.0 update doc.