Improve documentation and web test for web hooks
Tips and documentation of actual hook behavior. Improved user feedback
when testing hooks via the web UI.
See merge request !4015
Ci::Commit becomes a Pipeline object
1. Ci::Commit receives context: ref, :tag.
1. One Ci::Commit describes a one Pipeline
1. Pipeline is created from `.gitlab-ci.yml`
1. Pipeline is a ordered group of builds
1. We test MR against Pipeline
1. Pipelines have a separate view (https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/3703)
1. Pipeline can be triggered from UI (https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/3703)
1. Later we change `Trigger -> TriggerRequest -> Build` to `Trigger -> Pipeline` (future)
1. We add a Pipeline Hook that will be triggered on Pipeline status change (future)
1. We extend notifications to use `Pipeline Hook` to send summary on pipeline changes (future)
After merging that I'll prepare a separate MR that will unify naming, database columns, table names:
```
Ci::Commit -> Pipeline
Ci::Build -> Build
CommitStatus -> Job
GenericCommitStatus -> ExternalJob
ci_commits -> pipelines
ci_builds -> jobs
```
This MR implements first 5 points.
This is made to solve this issue https://gitlab.com/gitlab-org/gitlab-ce/issues/14149.
See merge request !3653
Because we were incorrectly supplying the tooltip title as
`data-original-title` (which Bootstrap's Tooltip JS automatically
applies based on the `title` attribute; we should never be setting it
directly), the value was being passed through as-is.
Instead, we should be supplying the normal `title` attribute and letting
Rails escape the value, which also negates the need for us to call
`sanitize` on it.
Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/15126
Updated UI for new merge request
Closes#2540


See merge request !3228
Improve performance of viewing individual issues
This MR does two things:
1. `Issue#related_branches` no longer performs Git operations that aren't needed
2. The output of `Repository#exists?` is now cached and flushed properly
Combined these two changes should further cut down the amount of Git operations performed when viewing individual issues (and possibly other pages).
See merge request !3296
These tests would check if the "This project is empty" banner would
contain SSH clone URLs. Oddly enough this should have never passed (as
far as I can tell) as SSH clone URLs in this banner are _only_ displayed
if the current user has at least 1 SSH key attached. Since the tests
never seem to create any they never should have passed, yet somehow they
did. To solve this the Spinach tests in question now ensure at least 1
SSH key is present.
1. Make the "subscribed" text in Issuable sidebar reflect the labels
subscription status
2. Current user mut be logged-in to toggle issue/MR/label subscription