Merge pull request #2991 from raphendyr/username_change_disablation

Add option to disable username changing

config/gitlab.yml.example

@@ -35,6 +35,7 @@ production: &base
     ## Project settings
     default_projects_limit: 10
     # signup_enabled: true          # default: false - Account passwords are not sent via the email if signup is enabled.
+    # username_changing_enabled: false # default: true - User can change her username/namespace
 
   ## Gravatar
   gravatar:

config/initializers/1_settings.rb

@@ -57,6 +57,7 @@ Settings.gitlab['support_email']  ||= Settings.gitlab.email_from
 Settings.gitlab['url']        ||= Settings.send(:build_gitlab_url)
 Settings.gitlab['user']       ||= 'git'
 Settings.gitlab['signup_enabled'] ||= false
+Settings.gitlab['username_changing_enabled'] = true if Settings.gitlab['username_changing_enabled'].nil?
 
 #
 # Gravatar