title: New class dont sync with panel admin django
body: <p>i just defined new class for my project. When I run server i dont recive errors just dont appears on the admin-django Panel.</p>
  
  <p>Here is the new class from <code>models.py</code></p>
  
  <pre><code>class Stock_Clinicas(models.Model):
      organization = models.ForeignKey(Organization, null=True, blank=True, on_delete=models.SET_NULL)
      products = models.ForeignKey(Products, null=True, blank=True, on_delete=models.SET_NULL)
      provider = models.ForeignKey(Provider, null=True, blank=True, on_delete=models.SET_NULL)
      stock_min = models.DecimalField('Stock minimo', max_digits=10, decimal_places=0)
      stock_opt = models.DecimalField('Stock optimo', max_digits=10, decimal_places=0)
      stock_act = models.DecimalField('Stock actual', max_digits=10, decimal_places=0, default=0)
  </code></pre>
  
  <p>and here my <code>admin.py</code>. i'll put all code.</p>
  
  <pre><code>from django.contrib import admin
  from stock.models import *
  
  from .models import Organization, OrganizationUser, OrganizationOwner
  
  
  class OwnerInline(admin.StackedInline):
      model = OrganizationOwner
      raw_id_fields = ('organization_user',)
  
  
  class OrganizationAdmin(admin.ModelAdmin):
      inlines = [OwnerInline]
      list_display = ['name', 'is_active']
      prepopulated_fields = {"slug": ("name",)}
  
  
  class OrganizationUserAdmin(admin.ModelAdmin):
      list_display = ['user', 'organization', 'is_admin']
      raw_id_fields = ('user', 'organization')
  
  
  class OrganizationOwnerAdmin(admin.ModelAdmin):
      raw_id_fields = ('organization_user', 'organization')
  
  
  class Stock_ClinicasAdmin(admin.ModelAdmin):
      list_display = ('stock_min', 'stock_opt', 'stock_act')
  
  
  admin.site.register(Stock_Clinicas, Stock_ClinicasAdmin)
  admin.site.register(Organization, OrganizationAdmin)
  admin.site.register(OrganizationUser, OrganizationUserAdmin)
  admin.site.register(OrganizationOwner, OrganizationOwnerAdmin)
  </code></pre>
  
  <p>Forget said, when I use syncdb the tables aren't created. I'm using Django 1.5.</p>
  
  <p>dont resolved yet</p>