Add 8.1 CE-to-EE update guide

[ci skip]

See merge request !35

[ci skip]

Fix Jenkins build URL with multi-project

Fixes #46 and #43

See merge request !31

Fix Jenkins CI parameters

Fixes #45

### Expected behavior

Multi-project and unstable Jenkins CI parameters should be successfully enabled and persisted if the boxes are checked.

### Observed behavior

If either of these checkboxes were selected and saved they were not persisted to the database. This is because the parameters were not in the list of allowed parameters in the controller.

See merge request !30

add issues template

This MR implements an issues template that can be set for a project.

![settings_issues_template](https://gitlab.com/gitlab-org/gitlab-ee/uploads/51c3b9cd82cbb2dfdce80ed5c0a406c3/settings_issues_template.png)  
![new_issue_issues_template](https://gitlab.com/gitlab-org/gitlab-ee/uploads/cd7d44440223923db676b88edd412eb9/new_issue_issues_template.png)

This closes gitlab-org/gitlab-ce#1378

@JobV @sytses you owe me a 🍺  😉 

This MR is only marked as WIP because the tests are still running and the `CHANGELOG` hasn't been updated to 8.1 yet.



See merge request !28

Fix LDAP group links API is not working as expected.

Fixes #329

See merge request !494

Abiliy to disable 'Share with Group' feature

https://dev.gitlab.org/gitlab/gitlab-ee/issues/331

See merge request !492

Addresses regression with jenkins setup that does not use the multiproject setup

The Jenkins Gitlab Hook Plugin allows for two kinds of setups.  One where a Jenkins job is created for each branch and one where all branches are built in a single Jenkins job.  MR !9 added support for the multi-job setup but broke the single job setup.  This request addresses #30 and fixes the regression.

See merge request !27

Add documentation for 'Share project with group' API call

https://dev.gitlab.org/gitlab/gitlab-ee/issues/322

See merge request !493

Look up Kerberos identity without the @REALM if a lookup for the full UPN did not find the identity.

Proposed fix for the issue reported as #34.

See merge request !26

Look up Kerberos identity without the @REALM if a lookup for the full UPN did not find the identity.

Update CHANGELOGs

[ci skip]

See merge request !25

[ci skip]

CE to EE



See merge request !490

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Fix CI permissions

![Screen_Shot_2015-09-21_at_20.23.16](https://gitlab.com/gitlab-org/gitlab-ce/uploads/6f40699507d0dce148d0054a093f0d63/Screen_Shot_2015-09-21_at_20.23.16.png)

This fixes two problems:
- Allow developers to retry builds
- Hide advanced project options from CI page for non-admin users



See merge request !1379

Add missing rake and change nginx config for CI migration

/cc @marin

See merge request !1385

Reformat and copy edit the CI-to-CE migration guide

[ci skip]

See merge request !1335

[ci skip]

Tweak remaining CSS for Markdown preview

See merge request !1383

- Rename "Finishing Up" to "Nginx configuration"
- Add fourth "Finishing Up" section
- Add Troubleshooting section with a link to backup restoration docs
- Change a few indented blocks into fenced blocks so they're highlighted
  properly.
- Added Marin's suggestions for CI-to-CE-on-different-server section.

Missed a few items in !1378

Ensure raise_error expectations provide arguments

See merge request !1381

Fix Error 500 when comparing non-existing branches

Closes #2593

See merge request !1355