Factor GITLAB_SHELL_VERSION get method

Don't enable IPv4 *only* on nginx.

I came across this issue when initially setting up gitlab and fixed it locally. Today, helping someone else set up their own instance, I came across this issue again:

The sample nginx configuration files disable IPv6 by default, making the server inaccesible unless the remote node has native IPv4. IPv4->IPv6 transition mechanisms don't help if the server have proper IPv6 DNS records in-place, which was the case for both of my servers.

This branch enables IPv4 and IPv6 by default. Older servers with no external IPv6 connectivity will not fail since they'll have a local-link IPv6 address to bind to anyway.

See merge request !231

Create dev fixture projects with fixed visibility

Do not require immediate password reset if specifying a password

Fix attachment ui

Fixes #1571

See merge request !1244

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Improve white code highlight in comments and wiki

![Screenshot 2014-11-05 16.36.55](https://dev.gitlab.org/uploads/dzaporozhets/gitlabhq/5723848593/Screenshot_2014-11-05_16.36.55.png)

See merge request !1241

Do not mention MR if commit is a part of MR

See merge request !1242

Fix system_silent call

Origin request has been provided by our contributor @cirosantilli. We had to revert it and rework.

origin commit - https://dev.gitlab.org/gitlab/gitlabhq/commit/0b1084a4538bc46684c8620410988d3b1093e7ab

See merge request !1243

This reverts commit b33d4bc2.

This reverts commit 0b1084a4.

Factor using Repository#path_to_repo

Update GitLab CI service to work with new GitLab CI

See merge request !1239

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Remove unnecessary authorisations

Because we already check read_project ability in `before_filter :project`

See merge request !1240

Remove unused authenticate_user from project#show

Remove dead Event#new_branch? method

Don't output to stdout from lib non-interactive methods [failure unrelated]

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Factor '0' * 40 blank ref constants [failure unrelated]

Fix version of test seed branches to specific revisions. Only clone if necessary.

Transform remove blob link into button.

improve SSH key emails

Fix log rotate permission error

It pollutes the test output too much.

Use xmlschema date format (ISO 8601) on system hooks timestamp

Attachment URL with non-/ relative root

Update default regex message to match regex.