Add comment about tls for ldap method

`omniauth-ldap` also supports tls for ldap method
Add group avatar to group page. Changed default avatar for group

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
Add a custom 502 page
no raw data rendering

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
An architectural overview of GitLab

This is to help new admins of GitLab understand what components
are involved in making GitLab work.
update links for gitlab.com
Clarifying web frontend direct file access

Rewrite how Apache/nginx interacts with precompiled assets.
Fix relative links in markdown. Related to #6182
updating structure doc
adding ref from structure to architecture
Merge pull request #6183 from Undev/fix_links_in_markdown

Fix relative links in markdown. Related to #6182
Improve issue box UI

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
Show images as raw and update the documentation.
Merge pull request #5842 from vikraman/patch-1

Add comment about tls for ldap method
 Merge branch 'nicer_502' into 'master'

Nicer 502
Merge branch 'master' of github.com:gitlabhq/gitlabhq
Fix note form width

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
Remove unnecessary text shadow

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
Highlight code search results
Use 100% width for note edit form