* upstream/master: (368 commits)
Don't fail on an empty database
Refactor authorization_for_merge_requests.md
Support MySQL too, when removing gitorious from import_sources
Remove gitorious from import_sources on ApplicationSetting model
Add links to new docs in merge_requests.md and workflow/README.md
Move merge request versions to its own document
Move "Only allow merge requests to be merged if the build succeeds" to new location
Move revert_changes.md to new location
Move cherry_pick_changes.md to new location
Move `wip_merge_requests.md` to a new location
Move merge_when_build_succeeds.md to new location
Fix missing flash messages on service edit page
Move authorization_for_merge_requests.md to new location
Move `workflow/merge_requests.md` to `user/project/merge_requests.md`
Update README.md
Fix randomly failing specs in expand_collapse_diff_spec:
Add link on API docs index page
Move CHANGELOG entries of !5361, !5451 and !5887 from 8.11 to 8.12
Remove suggested colors hover underline
Fix markdown anchor icon interaction
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