Simplify code around (cross)-references

See merge request !1568

Show warning when build is pending and there are not runners

This change is based on: !1530.

This resolves #2967.



See merge request !1573

Add a few predefined variables to CI builds

This adds CI_BUILD_TAG, CI_BUILD_STAGE, CI_BUILD_NAME and CI_BUILD_TRIGGERED to build environment.

This change is based on: !1530 

See merge request !1572

Fix: Images cannot show when projects' path was changed

Fixes #1443

See merge request !1521

Revert "Improve invalidation of stored service password if the endpoint URL is changed"

This reverts commit b4639754.

See merge request !1595

This reverts commit b4639754.

Improve invalidation of stored service password if the endpoint URL is changed

A number of issues were found in !1490 and !1558 (triggered by support request 7395)

* It is not possible to set a new URL and a password at the same time (new password is ignored)
* An error occurs on the Service Templates admin pages (prop_updated? was referencing the service's project, which is not defined for templates)
* Passwords are reset on every save in Service Templates admin pages

This should fix these 3 issues by respectively:
* Differentiating a property that has been assigned a new value (regardless of the new value) and a property that has been assigned a new value that is different from the old one
* Providing an alternate implementation to detected updated properties, not relying on the service's project
* Filtering an empty password parameter passed to the Service Templates admin page like on the project service page

See merge request !1583

Slightly refactor runner status detection: moving it to Runner class
Signed-off-by: Kamil Trzcinski <ayufan@ayufan.eu>

Fix retry and cancel for build

This fixes some regressions introduced by Commit Status API

See merge request !1586

It now allows to specify a password at the same time as the new URL, and works
on the service template admin pages.

+ and Titleize New Project button on dashboard

Hello there. Its my first merge request in open source world. So please be tolerant to me if i do something wrong.

I try to fix https://gitlab.com/gitlab-org/gitlab-ce/issues/2906

See merge request !1564

Enable arbitration in MailRoom

Fixes #2870.

See merge request !1566

Tweak api doc

merge_request: add work_in_progress to MR hooks



See merge request !1443