feat(kolab)!: Remove Kolab backends

Core (7 changes):
- Removed 3 factory files: KolabServer.php, KolabSession.php, KolabStorage.php
- Modified Auth.php: Removed kolab driver case
- Modified Group.php: Removed Kolab driver case
- Modified Prefs.php: Removed KolabImap driver case
- Modified Share/Driver.php: Removed Kolab from storage map

Closes #78

Author: ralflang

lib/Horde/Core/Factory/Auth.php

@@ -146,11 +146,6 @@ protected function _create($driver, $orig_params = null)
                 $params['imsp'] = $this->_injector->getInstance('Horde_Core_Factory_Imsp')->create();
                 break;
 
-            case 'horde_auth_kolab':
-                $params['kolab'] = $this->_injector
-                    ->getInstance('Horde_Kolab_Session');
-                break;
-
             case 'horde_core_auth_ldap':
             case 'horde_core_auth_msad':
                 $params['ldap'] = $this->_injector

lib/Horde/Core/Factory/Group.php

@@ -27,13 +27,6 @@ public function create(Horde_Injector $injector)
                 $params['api'] = $GLOBALS['registry']->contacts;
                 break;
 
-            case 'Kolab':
-                $class = 'Horde_Group_Kolab';
-                $params['ldap'] = $injector
-                    ->getInstance('Horde_Core_Factory_Ldap')
-                    ->create('horde', 'group');
-                break;
-
             case 'Ldap':
                 $class = 'Horde_Core_Group_Ldap';
                 $params['ldap'] = $injector