Allow disabling Gravatars in gitlab.yml settings

Closes #1237

config/gitlab.yml.example

@@ -1,4 +1,4 @@
-# # # # # # # # # # # # # # # # # # 
+# # # # # # # # # # # # # # # # # #
 # Gitlab application config file  #
 # # # # # # # # # # # # # # # # # #
 
@@ -19,14 +19,14 @@ email:
 
 # Application specific settings
 # Like default project limit for user etc
-app: 
-  default_projects_limit: 10 
+app:
+  default_projects_limit: 10
   # backup_path: "/vol/backups"   # default: Rails.root + backups/
   # backup_keep_time: 604800      # default: 0 (forever) (in seconds)
+  # disable_gravatar: true        # default: false - Disable user avatars from Gravatar.com
 
-
-# 
-# 2. Advanced settings: 
+#
+# 2. Advanced settings:
 # ==========================
 
 # Git Hosting configuration
@@ -39,7 +39,6 @@ git_host:
   receive_pack: true
   # port: 22
 
-
 # Git settings
 # Use default values unless you understand it
 git:

config/initializers/1_settings.rb

@@ -111,5 +111,9 @@ class Settings < Settingslogic
     def backup_keep_time
       app['backup_keep_time'] || 0
     end
+
+    def disable_gravatar?
+      app['disable_gravatar'] || false
+    end
   end
 end