Merge branch 'bug-to-ldap-configuration' into 'master'

LDAP Configuration Fix

This fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/180 in new installations of version 6.8 (installations upgraded from 6.7 still have the issue, however).

config/initializers/devise.rb

@@ -223,6 +223,7 @@ Devise.setup do |config|
       method:   Gitlab.config.ldap['method'],
       bind_dn:  Gitlab.config.ldap['bind_dn'],
       password: Gitlab.config.ldap['password'],
+      filter:   Gitlab.config.ldap['user_filter'],
       name_proc: email_stripping_proc
   end