Bump Git version requirement to 2.7.4 (for 8.5)

[ci skip]

See merge request !3286

Install Git 2.7.3, not 2.4.3



See merge request !3248

Bump Git version requirement to 2.7.3

[ci skip]

See merge request !3240

[ci skip]

Use leases for LDAP checks in 8.5

Back-port of https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/3143

See merge request !3181

Allow filtered explore results to be paged. Fixes #14104

See merge request !3149

Fix "Show all" link behavior

The "Show all" link was broken by recent refactors from @joshfng. I have fixed it very simply (I believe).

**Please note that this fix will be in 8.5.x only** (since the whole "Show all" stuff was moved to pagination recently (8.6).

Fixes #14168 

/cc @joshfng @dzaporozhets @razer6 

See merge request !3159

Fixes #14168

Fix error 500 in Todos

Closes #14095

Closes #14075

Closes #14109

Closes #14151

See merge request !3141

Only show group member roles if explicitly requested

This very simply fixes an EE problem, but I made the change here so it's less prone to errors from merges.

In EE, prior to this change, group member roles were shown in project member list when a project is shared with a group. This is bad because the project explicitly shares with the group and sets a 'max access' level. If the max access level is 'developer' the project owner doesn't want to see 'Owner' in the group roles because it will confuse them. I verified that permissions are really being honored here, it was just an error in the view. You can see in https://gitlab.com/gitlab-org/gitlab-ee/blob/master/app/views/projects/project_members/_shared_group_members.html.haml#L18 where this was how it was intended to be. Likely a CE-EE merge introduced this bug. That's why I made the boolean required in CE even though this is for EE.

![Screen_Shot_2016-03-01_at_8.59.02_AM](/uploads/704ab3149f60c363dd8374bd0c06a46a/Screen_Shot_2016-03-01_at_8.59.02_AM.png)

![Screen_Shot_2016-03-01_at_9.17.54_AM](/uploads/5fcabef352cbc41dade037767f90ace3/Screen_Shot_2016-03-01_at_9.17.54_AM.png)

See merge request !3044

Teach GitLab not only to merge changes from a merge-request, but also to
apply patches posted to merge-request in a way like `git am` would do -
without merge commit and directly on top of current branch. Which way to
go is selected by user in web UI, and apply patches is the first option.

There are 3 cases:

- only 1 commit is present in MR -> the only available option is to
  apply that single commit as one patch without a merge

  ( There is no need for merge commit in this case at all: information
    about user who applied the patch goes to "Committer" field in resultant
    commit. Avoiding 1 merge per 1 patch results in cleaner history )

  It is also possible to review patch description directly in web UI,
  before doing the actual application, and correct / amend it as needed.

- several commits are present in MR:

  * it is possible to apply the patches directly on top of current
    branch. Again information about who applied what goes to "Committer"
    field.

  * it is possible to merge MR changes with making a merge commit.

    This variant is useful, when patches from a MR do several logical
    steps to reach one goal, and MR description contain cover letter for
    whole patch series.

    in this case original commits stay untouched and resulting merge
    will contain MR author as author, user who accepted MR as committer,
    and cover letter as merge commit message.

    NOTE we avoid useless "Merge branch X into Y" in merge message, and
        just put MR title into merge subject and MR description into merge
        description.

        This way it is more logical with more important information in
        merge subject and thus e.g. more handy to oversee what a merge brings,
        just by it subject, e.g. via looking at updates via

            gitk --first-parent ...

        or via web.

NOTE for pre-generated references to merge-request we now use full MR
    URL, instead of !<MR-n>. Full URLs work everywhere, not only on
    original site where MR was created, or even only in original repo
    and not its fork on the same site.

* origin/8-5-stable:
  Remove "(unreleased)" from 8.5.4 release notes
  Merge branch 'fix/invalidate-builds-badge-cache' into 'master'
  Version 8.5.3
  Merge branch 'renaming-repository-caching' into 'master'

[ci skip]

Invalidate cache for builds badge

This fixes cache issue with badges (we should not cache badge images).

Closes #13982

See merge request !3086

Flush repository caches before renaming projects

This should hopefully solve gitlab-org/gitlab-ce#13790. Once I know the exact steps to reproduce the problem I should be able to confirm this.

cc @dblessing @inem

See merge request !2974

* 8-5-stable:
  Version 8.5.2
  Merge branch 'docs_todos' into 'master'
  Merge branch 'fix/13785-dashboard-projects-display-welcome-after-search' into 'master'
  Merge branch 'fix/13781-delete-tag-without-ajax' into 'master'
  Merge branch 'fix/deprecated-ci-badge-permissions' into 'master'
  Merge branch 'issue_13623' into 'master'
  Merge branch 'fix/12652-omniauth-import-from-gitlab-com-fails' into 'master'
  Merge branch 'shortcuts-help' into 'master'
  Merge branch 'rel-url-fix' into 'master'
  Merge branch 'sidebar-overlap-fix' into 'master'
  Merge branch 'rs-improve-grace-period' into 'master'
  Merge branch 'issue_13648' into 'master'
  Merge branch 'issue_13621' into 'master'
  Merge branch 'issue_13851' into 'master'
  Merge branch 'fix-migration' into 'master'
  Merge branch '11489-branded-appearance-to-ce' into 'master'
  Update Rails to 4.2.5.2

Add Todos documentation

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/13884

See merge request !3064

Don't show "Welcome to GitLab" when the search didn't return any projects

Fixes #13785. /cc @pixdrift

### Before

![Screen_Shot_2016-03-02_at_10.55.02](/uploads/b6b6ead2143d01e374ad296e72182d79/Screen_Shot_2016-03-02_at_10.55.02.png)

### After

![Screen_Shot_2016-03-02_at_12.12.33](/uploads/6e16c44e69039c534ea0fc3373c6060b/Screen_Shot_2016-03-02_at_12.12.33.png)

See merge request !3059

Tag deletion doesn't use AJAX anymore

See merge request !2986

Fix permissions for deprecated CI build status badge

This fixes permissions for deprecated status badge, being unavailable even if project is public.

Closes #13324

See merge request !3030

Show days remaining instead of elapsed time for Milestone.

Closes #13623

See merge request !2978

Fix import from gitlab.com fails

_Originally opened at !2896 by @kazsw._

- - -

Fixes #12652

CGI.escape encodes '/' by default.
Second argument can be removed.

See merge request !2988

Fix help keyboard shortcut for relative URL setups

Fixes gitlab-org/gitlab-ce#12751

See merge request !3016

Fix relative URL

See https://github.com/gitlabhq/gitlabhq/issues/10053

 1. Same configuration way for relative URL like with Omnibus
 2. Loading the relative configuration from Rakefile as Rails do not load initializers for `asset:precompile`

First point has another positive side effect: no collisions (due to git controlled `application.rb`) any more during the upgrades of source based installations and relative url configuration

 - [x] tests on the source based installation
 - [x] tests on the centos&ubuntu omnibus packages

Fixes: gitlab-org/gitlab-ce#13730, gitlab-org/gitlab-ce#13727, gitlab-org/omnibus-gitlab#1143 and https://github.com/gitlabhq/gitlabhq/issues/10053

See merge request !2979

Fix issue with overlap of sidebar links.

Thanks @iamphill for the help with this one. 

![Screen_Shot_2016-03-01_at_10.19.52_AM](/uploads/f203fde79ae397ad18f23c4108f1c306/Screen_Shot_2016-03-01_at_10.19.52_AM.png)

cc @iamphill @alfredo1 @dzaporozhets @rymai 

See merge request !3043

Don't show any "2FA required" message if it's not actually required

Prior, if the user had enabled and then disabled 2FA, they would be
shown a "You must enable Two-factor Authentication for your account."
message when going back to re-activate it, even if 2FA enforcement was
disabled.

See merge request !3014

Improve implementation to check read access to forks and add pagination.

Fixes #13648

The following optimizations where made:

- Pagination was added.
- Code to check for read permissions to forks was optimized, in the past we were doing too many queries for each project.

See merge request !2991