title: Django get instance in inline form admin
body: <p>Have a inline form class:</p>
  
  <pre><code>class ItemColorSelectForm(forms.ModelForm):
      def __init__(self, *args, **kwargs):
          super(ItemColorSelectForm, self).__init__(*args, **kwargs)
          #here i need current object
  </code></pre>
  
  <p>Inline class:</p>
  
  <pre><code>class ItemColorSelectInline(generic.GenericTabularInline):
      model = ColorSelect
      extra = 1
      form = ItemColorSelectForm
  </code></pre>
  
  <p>Admin class</p>
  
  <pre><code>class ItemAdmin(admin.ModelAdmin):
      inlines = [ItemColorInline,]
  </code></pre>
  
  <p><strong>Question:</strong> how can a get current object in <code>ItemColorSelectForm</code>.</p>
  
  <p><code>print kwargs</code> return:</p>
  
  <pre><code>{'auto_id': u'id_%s', 'prefix': u'catalog-colorselect-content_type-object_id-__prefix__', 'empty_permitted': True}
  </code></pre>