Attachment URL with non-/ relative root

The attachment URL was not working with relative_url_root not equal to '/'. I suggest this fix.
append .xmlschema to system hook timestamp
Handle undefined text area values

Check to see if a text area's `val` is defined before trying to call
`replace()` on it.
Change gitlab/log permissions in installation.md

This patch changes default permission of the gitlab/log directory to
u+rwX,go-w. This is done to make the directory NOT readable by group and
others and to avoid logrotate complaining about it. chmod 755 is not
used to avoid setting executable bit on file within the log dir.
Fix milestone link in issue. Closes #174 (gitlab.com).
Fix version of test seed branches.
Use button type=submit instead of input.
Update default regex message to match regex.
Fix identation.
transfer_service_spec: cleanup, merge common code, check against nil

- replace creation of group2 with the use of group without add_owner(user)
- fold TransferService calls into new test function transfer_project
  - remove currently not used (and not working) gitlab_shell stub
    (will submit testcase simulating failure in gitlab_shell separately)
- add checks against not be_nil (result.should be_false passes even if nil)
Add issueable actor
Dry admin logs.
fonts: Added "DejaVu Sans Mono" and "Ubuntu Mono"

Everything is better than "Courier New" ...
support latest firefox esr release
Display renamed files in diff views

Show both the old and new filenames when viewing the diff for a renamed
file.
Add option to keep repo on project delete

Update the project API controller to use `Projects::DestroyService`
instead of calling `Project#destroy` directly.

Also add an optional parameter, `:keep_repo`, that allows a project to
be deleted without deleting the repository, wiki, and satellite from
disk.
Remove unneeded app/finders config.autoload path

Every directory under app/ is searched by default
Document Markdown table formatting issue

Add a note to the Markdown documentation about a quirk of Redcarpet's
table parsing.
fix exclude wiki regex

the new regex allows importing repositories with repository name ending with wiki but still exclude gitlab wiki repositories
Use :message key, not :error for File::Service.