Merge branch 'blacklist/unsubscribes' into 'master'

Add 'unsubscribes' to the paths blacklist

This is to prevent issues with the admin email feature in GitLab EE.

See merge request !1034

lib/gitlab/blacklist.rb

@@ -3,7 +3,30 @@ module Gitlab
     extend self
 
     def path
-      %w(admin dashboard files groups help profile projects search public assets u s teams merge_requests issues users snippets services repository hooks notes)
+      %w(
+        admin
+        dashboard
+        files
+        groups
+        help
+        profile
+        projects
+        search
+        public
+        assets
+        u
+        s
+        teams
+        merge_requests
+        issues
+        users
+        snippets
+        services
+        repository
+        hooks
+        notes
+        unsubscribes
+      )
     end
   end
 end