Merge branch 'timezones' into 'master'

Changing your time zone

Added doc and link in workflow to how to change your time zone in Gitlab.

I used the following documents as reference. Please double check that the instructions I wrote are correct.
http://www.borngeek.com/2015/02/27/setting-the-time-zone-in-gitlab/
https://gitlab.com/gitlab-org/gitlab-ce/issues/443

I found that several users have this same issue, that they don't know how to change their time zone:
https://github.com/gitlabhq/gitlabhq/issues/5555
https://gitlab.com/gitlab-org/omnibus-gitlab/issues/347
https://gitlab.com/gitlab-org/gitlab-ce/issues/56
http://jonathonreinhart.blogspot.com/2014/10/gitlab-time-zone-issues.html
http://stackoverflow.com/questions/5073917/why-doesnt-config-time-zone-seem-to-do-anything

See merge request !1827

doc/workflow/README.md

@@ -12,4 +12,5 @@
 - [Project importing from GitHub to GitLab](import_projects_from_github.md)
 - [Project importing from GitLab.com to your private GitLab instance](import_projects_from_gitlab_com.md)
 - [Protected branches](protected_branches.md)
+- [Change your time zone](timezone.md)
 - [Web Editor](web_editor.md)
\ No newline at end of file

doc/workflow/timezone.md

+# Changing your time zone
+
+GitLab defaults its time zone to UTC. It has a global timezone configuration parameter in config/application.rb. 
+
+To update, add the time zone that best applies to your location. Here are two examples:
+```
+gitlab_rails['time_zone'] = 'America/New_York' 
+```
+or
+```
+gitlab_rails['time_zone'] = 'Europe/Brussels'
+```
+
+After you added this field, reconfigure and restart:
+```
+gitlab-ctl reconfigure
+gitlab-ctl restart
+```
\ No newline at end of file