Merge remote-tracking branch 'upstream/pipeline-hooks-without-slack' into wall-clock-time-for-showing-pipeline
* upstream/pipeline-hooks-without-slack:
Make explicit call for all event types for ProjectHook factory
Capitalise URL on web_hooks/form
Remove changes not related to this MR
Added documentation for pipeline hooks
Rename queue to enqueue in tests
Instrument Project.visible_to_user
Fix build play failure
Update ruby 2.3.1
Improve transition between states for event `enqueue`
Use event `enqueue` instead of `queue`
Fix test failures
Fix bug where destroying a namespace would not always destroy projects
Remove unused SpamReport model; this was renamed to SpamLog
Corrected links/usernames in performance guide
Add gravatars to build history
Add deployment ID and gravatar to environments page
Format environment history page
Add avatar to commit message; environment style updates to match pipelines page
Style deploy button
