Public projects listed in the public section will be linked to the
actual project's page. Public projects now give any user Guest
permissions to the project, allowing them to download the code, read
and create issues, and view anything else in the project's pages.

Ample access tests have been added to the project_access_spec to
verify correct permissions and behavior on public projects.
- Visitors to the site who are not logged in still cannot view the
  project's pages.
- Logged-in users visiting a public project where they are not a team
  member can create issues, but not snippets. They can view the projects
  code, issues, merge requests, etc, just as if they were a Guest member
  of the project.
- Since this is a public project, the user is also granted :download_code
  permissions, a permission normally reserved for Reporters, since they
  can clone the repo anyways and browse commits and branches locally.

Swapped out placeholder text on teams admin page

Changed "simple Teams description" placeholder subtitle to "allow you
to organize groups of people that have a common focus. Use teams to
simplify the process of assigning roles to groups of people."

Show emoji popup if colon preceding by space or is new line.

Add monokai highlighting theme

Authenticate LDAP users in the grack module - fixed problems - tested code

Diff with better colors and some spacing on the corners

fixed broken gitlab version determination during backup

Upgrade guide cleanup

move the update guides from the wiki into the repo

move the update instructions for 4.2 to 5.0 from the Wiki into the Repo

Instructions update: install postfix separately, new privilege to mysql users, sockets dir. Fixes #3639

Fixed typo in app/views/deploy_keys/index.html.haml