The method Ability.issues_readable_by_user takes a list of users and an
optional user and returns an Array of issues readable by said user. This
method in turn is used by
Banzai::ReferenceParser::IssueParser#nodes_visible_to_user so this
method no longer needs to get all the available abilities just to check
if a user has the "read_issue" ability.

To test this I benchmarked an issue with 222 comments on my development
environment. Using these changes the time spent in nodes_visible_to_user
was reduced from around 120 ms to around 40 ms.

Cache the commit author in RequestStore to avoid extra lookups in PostReceive

See merge request !5537

Update to gitlab_git 10.4.1 and take advantage of preserved Ref objects

See merge request !5536

* upstream/master: (45 commits)
  Replace reject_blocked with reject_blocked! in callbacks.
  Fix Project#to_param to keep invalid project suitable for use in URLs
  Update CHANGELOG
  Add feature specs for edit project settings
  Fix renaming repository when name contains invalid chars under settings
  Change requests_profiles resource constraint to catch virtually any file
  Allow skipping users in autocomplete
  Fix typo in CHANGELOG
  Update CHANGELOG
  Respective cache is now expired when creating a new branch
  Update CHANGELOG
  Unify HTML format in static error pages
  Make error pages responsive design
  Move color-logic into HipchatService#HipchatService
  Depened on exact version of SimpleCov when patched
  Refactor spam validation to a concern that can be easily reused and improve legibility in `SpamCheckService`
  Refactor `SpamCheckService` to make it cleaner and clearer.
  Submit all issues on public projects to Akismet if enabled.
  Submit new issues created via the WebUI by non project members to Akismet for spam check.
  Upgrade Bullet from 5.0.0 to 5.2.0.
  ...

Resolve "HipChat notifications missing colors"

_Originally opened at !2322 by @eisnerd._

- - -

## What does this MR do?

This MR restores the colors mentioned in #5571 by overriding the color setting with green/red just for build events.

## What are the relevant issue numbers?

Closes #5571.

See merge request !5498

Project and branch cache is expired when project is still
empty or new branch is created. develops tests accordingly

Signed-off-by: Rémy Coutable <remy@rymai.me>

* upstream/master: (38 commits)
  Remove useless new route
  Update gitlab-shell version to 3.2.1 in the 8.9->8.10 update guide
  Fix typo in Elixir CI template
  Add a spec for access_for_user_ids
  Fix typo in comment
  Rubocop offenses
  Optimize the invited group link access level check
  Incorporate review comments
  Optimize maximum user access level lookup in loading of notes
  Fix missing schema update for 20160722221922
  Whitelist 'Simplified BSD' license
  Fix a bug where forking a project from a repository storage to another would fail
  Remove inline scripts from import pages.
  Make branches sortable without push permission (!5462)
  Profile requests when a header is passed
  Upgrade database_cleaner from 1.4.1 to 1.5.3.
  Show release notes in tag list
  Fix expand all diffs button in compare view
  Add route for Import::GithubController#new
  Update CHANGELOG
  ...