Allow underscore as the first char for project names.

[6.6] Fixes a bug with group member administration

Group owners were not able to remove any users from their group if they were the only owner.

Catch missing commands in Rake tasks

Remove Dot Org

Add envrc to git-ignore

Respect custom gitlab_shell path in gitlab:gitlab_shell:check task

Natural version sorting

Add Enterprise Linux

Increase Nginx Push Size

Fix now-invalid invocation of `run_and_match` in gitlab:check

Fix grammar in zero_authorized_projects view

Must have been left over from a previous revision, but the argument
wasn't used anywhere in the method.

This was causing the gitlab:check task to exit prematurely with the
error "System commands must be given as an array of strings."

Prior to this change, if I customized the config value of
`gitlab.gitlab_shell.path`, the check would ignore this value in favor
of `"~<gitlab.gitlab_shell.ssh_user>/gitlab-shell/"` resulting in a
failed check when the configuration was otherwise valid.

Correct typos in web_hooks help.

Sort projects by activity at group show page

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

Fix Discover Branch

Fixes #1073

envrc files are created when you use direnv (Its recommended in
combination with spring, see: https://github.com/rails/spring#setup)

Use rails helper image-url for reference images in css

Fixes #1001

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

Added part about the help to markdown

Not sure if the default_regex really has to be expanded for this special use case. We tried to extend only the project_name_regex first, but that didn't help.

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

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