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
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 version of test seed branches.
Update default regex message to match regex.
Add issueable actor
Remove unused authenticate_user from project#show

Redundant with the authorize_read_project! filter
Transform remove blob link into button.
Create dev fixture projects with fixed visibility
Factor behaviors.scss constants
improve ssh key emails
Removed + '' +
clarify that 'template1=#' is part of prompt

Similar to https://github.com/gitlabhq/gitlabhq/blob/master/doc/install/database_mysql.md clarify that `template1=#` is part of the prompt.
Quit the database session at end of database setup
Session API: Use case-insensitive authentication like in UI
Continue strings with backslash instead of append
Expose projects_limit through users API if UserFull.
Merge branch 'master' into jastkand/gitlab-ce-fix-api-auth

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

Conflicts:
	CHANGELOG
Don't enable IPv4 *only* on nginx.

The current configuration sample files only enable IPv4 by default, making the
server inaccesible for many remote hosts (and an increasing amount every day).

Enable 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.
Remove dead Event#new_branch? method