Import the database as the `git` user

This ensures that all tables created during the import belong to `git`.
If you import as a different user, such as the `postgres` superuser, you
may encounter issues where the GitLab database user cannot access tables
in gitlabhq_production, _even if_ `git` is the owner of
gitlabhq_production at the time of import.
Cleaner UI for login/signup pages

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
Set charset encoding to UTF-8 for snippets

Fixes #2678

Signed-off-by: Jeroen van Baarsen <jeroenvanbaarsen@gmail.com>
Use one word per line in Gitlab::Blacklist
Add 'unsubscribes' to the paths blacklist

GitLab EE has a /unsubscribes/ route.
Always set the origin remote in satellite actions

This prevents issues with satellites containing outdated origin remotes
after administrators move the git repositories directory.
change X-Frame-Options to SAMEORIGIN

needed to allow sidekiq to load on background jobs tab
unify nginx config files
remove prerelease note from 6.0 to 7.2 guide
clarify which configs should be updated
Merge pull request #7584 from bbodenmiller/patch-9

remove prerelease note from 6.0 to 7.2 guide
Merge pull request #7585 from bbodenmiller/patch-11

clarify which configs should be updated
7.3 started
Remove outdated 6.0 to 7.1 update guide
Merge pull request #7578 from bbodenmiller/patch-8

Unify Nginx files to match as closely as possible
Merge branch 'cleaner-login' into 'master'

Cleaner UI for login and signup pages

![Screenshot 2014-08-15 17.51.52](https://dev.gitlab.org/uploads/dzaporozhets/gitlabhq/fc8bf3c4a4/Screenshot_2014-08-15_17.51.52.png)
![Screenshot 2014-08-15 17.52.39](https://dev.gitlab.org/uploads/dzaporozhets/gitlabhq/72706f55b0/Screenshot_2014-08-15_17.52.39.png)
![Screenshot 2014-08-15 17.51.33](https://dev.gitlab.org/uploads/dzaporozhets/gitlabhq/c46f972944/Screenshot_2014-08-15_17.51.33.png)

See merge request !1022
Merge branch 'import_postgres_user' into 'master'

Import the database as the `git` user

See merge request !762
Merge branch 'always_set_satellite_origin' into 'master'

Always set satellite origin

See merge request !1036
Merge branch 'blacklist/unsubscribes' into 'master'

Add 'unsubscribes' to the paths blacklist

This is to prevent issues with the admin email feature in GitLab EE.

See merge request !1034
Merge pull request #7558 from bbodenmiller/patch-4

change X-Frame-Options to SAMEORIGIN for nginx SSL config