Fix Weight display in Issuables' collapsed sidebar

Fixes #284.

/cc @jschatz1 

### No weight set

![Screen_Shot_2016-02-15_at_16.02.59](/uploads/3a46684f90531fe1e319a17147272c10/Screen_Shot_2016-02-15_at_16.02.59.png)

---

### Weight set

![Screen_Shot_2016-02-15_at_16.03.18](/uploads/24accd1e795d16f4802ea1f0fe98f588/Screen_Shot_2016-02-15_at_16.03.18.png)

See merge request !184

Improved LDAP documentation about the use of multiple servers [ci skip]

cc @ernstvn

See merge request !177

[ci skip]

Fix EE builds

If we specify a new `services` in context of `job` we need to specify all used services, because they overwrite what is specified in global context.

It did not fail for some builds, because we still have mixed infrastructure: Some runners do have pre-configured mysql, postgres and redis in their environment.

All future runners will be migrated to drop the pre-configured services.

/cc @vsizov 


See merge request !176

Improve error message for prohibited filenames

Will fix #202

See merge request !162

Fix Elasticsearch blob results linking to the wrong reference ID

If Elasticsearch returned a hit for a blob, clicking on the link would
always return a 404 since the OID, not the commit SHA, was being used.

See merge request !181

If Elasticsearch returned a hit for a blob, clicking on the link would
always return a 404 since the OID, not the commit SHA, was being used.

Remove deprecated SSL warning on web hooks documentation

Closes https://gitlab.com/gitlab-org/gitlab-ee/issues/289

See merge request !178

[ci skip]

See merge request !175

Add documentation on relative URL support

closes #12773

See merge request !2770

[ci skip]

See merge request !171

[ci skip]

Updated install/update guides for 8.5



See merge request !2766

[ci skip]

Add ajax filtering to all paged project lists. Fixes #13182



See merge request !2728

Ensure link for README blobs includes the full path

Closes #13254

See merge request !2774

Closes #13254

Add notice about variables in build log

Related to: https://dev.gitlab.org/gitlab/gitlabhq/merge_requests/1942

[ci skip]

See merge request !2761

Prevent rasterization artifacts in the logo, and simplify markup.

 - Remove sketch-namespaced attributes.
 - Remove unused groups, and cancel out unnecessary transforms.
 - Use overlap to avoid rasterization artifacts in the logo.
 - Remove viewBox parameter and define paths in their final form.

See merge request !2741

[ci skip]

Freeze constants in Gitlab::Git

See merge request !1730

Smarter flushing of branch statistics caches

This basically ensures we only flush caches of branches whenever we really have to. See commit c514f8b850219cd3e5526e73e1d00e6729e2b466 for the details.

cc @joshfng @rspeicher 

See merge request !2769

Tests for ES



See merge request !159

Change default smpt port to 465 (default smtps port)

Instead of flushing the behind/ahead counts for all branches upon every
push we now only flush the cache of branches that actually need to have
these statistics recalculated. There are now basically 2 scenarios and
their effects:

1. A user pushes a commit to the default branch, this results in the
   cache being flushed for all branches.
2. A user pushes to a non default branch, this results in _only_ the
   cache for that branch being flushed.

The existing code (Repository#expire_cache) remains backwards compatible
with the previous behaviour, the new behaviour is only applied when a
branch name is passed as an argument. This ensures that when for example
a project is deleted the cache for all branches is flushed.

Add index for snippet's updated_at

@DouweM We are ordering by `updated_at` but there is no index.

cc @yorickpeterse 

See merge request !2768

Expose MergeRequest#merge_status

_Originally opened at !2478 by @develop7._

- - -

This enables API users to see whether a merge request can be merged without conflicts.

See merge request !2756