add a custom field long choice basic

The `custom field long choice` aim to provide a way to deal with choices
with a big possibilities.

The `custom field long choice` allow :
- to persist different options in the database ;
- each option has a key, a text (translatable string), and eventually a
  parent, and an internal_key
- every key can be activate or not. If the parent is inactivated, all
  childs are inactivated
- the internal key have two purposes :
    - link to an external csv file, with their own key ;
    - add a special class to results, to allow custom layout.

Currently, the field exists, but some elements are missing :

- a script for CSV import
- possibility to select multiple items
- edition of options
- handle of option without parents
- tests are missing

Entity/CustomFieldLongChoice/Option.php

@@ -0,0 +1,153 @@
+<?php
+
+/*
+ * Copyright (C) 2015 Julien Fastré <julien.fastre@champs-libres.coop>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+namespace Chill\CustomFieldsBundle\Entity\CustomFieldLongChoice;
+
+/**
+ * 
+ *
+ * @author Julien Fastré <julien.fastre@champs-libres.coop>
+ */
+class Option
+{
+    /**
+     *
+     * @var int
+     */
+    private $id;
+    
+    /**
+     *
+     * @var string
+     */
+    private $key;
+    
+    /**
+     * a json representation of text (multilingual)
+     *
+     * @var array
+     */
+    private $text;
+    
+    /**
+     *
+     * @var \Doctrine\Common\Collections\Collection
+     */
+    private $children;
+    
+    /**
+     *
+     * @var Option
+     */
+    private $parent;
+    
+    /**
+     *
+     * @var string
+     */
+    private $internalKey = '';
+    
+    /**
+     *
+     * @var boolean
+     */
+    private $active = true;
+    
+    public function getId()
+    {
+        return $this->id;
+    }
+
+    public function getKey()
+    {
+        return $this->key;
+    }
+
+    public function getText()
+    {
+        return $this->text;
+    }
+
+    public function getChildren()
+    {
+        return $this->children;
+    }
+
+    public function getParent()
+    {
+        return $this->parent;
+    }
+
+    public function setKey($key)
+    {
+        $this->key = $key;
+        return $this;
+    }
+
+    public function setText(array $text)
+    {
+        $this->text = $text;
+        return $this;
+    }
+
+    public function setParent(Option $parent = null)
+    {
+        $this->parent = $parent;
+        $this->key = $parent->getKey();
+        return $this;
+    }
+    
+    /**
+     * 
+     * @return boolean
+     */
+    public function hasParent()
+    {
+        return $this->parent === NULL ? false : true;
+    }
+    
+    public function getInternalKey()
+    {
+        return $this->internalKey;
+    }
+
+    public function isActive()
+    {
+        return $this->active;
+    }
+    
+    public function getActive()
+    {
+        return $this->isActive();
+    }
+
+    public function setInternalKey($internal_key)
+    {
+        $this->internalKey = $internal_key;
+        return $this;
+    }
+
+    public function setActive($active)
+    {
+        $this->active = $active;
+        return $this;
+    }
+
+
+}