title: Django static url auto prefixes
body: <p>I've seen quite alot of questions &amp; answers on this topic, but none helped me.
  So, the problem is: none of static files are served till i manually add '/' before any adress in adresses in html.
  And i always get double static files folder prefix on adresses, like this: 'content/static/content/static/js/my.js'</p>
  
  <p>The last problem, that i CANT get over, is this image cropping field isnt working, i assume becouse it cant get right image url, becouse of double prefix written above. I cant fix it, becouse the mechanism is written inside the <a href="https://github.com/jonasundderwolf/django-image-cropping" rel="nofollow">https://github.com/jonasundderwolf/django-image-cropping</a>. Is there a way to change this django behavior? In the redactor field i had same problem, but i fixed it with manually overwriting save() method, changing the url of uploaded images so they begin to be displayed, but it doesnt work automatically and i cant understand why.
  Help please.</p>
  
  <p>I tried {% static 'some_file' %}, sometimes its working, sometimes not, so its not a solution.</p>
  
  <p>So, my django project structure is this:</p>
  
  <ol>
  <li>project
  
  <ul>
  <li>content
  
  <ul>
  <li>templates</li>
  <li>static</li>
  <li>etc</li>
  </ul></li>
  <li>project</li>
  </ul></li>
  </ol>
  
  <p>project/urls.py:</p>
  
  <pre><code>from django.conf.urls import include, url
  from django.contrib import admin
  
  urlpatterns = [
      url(r'^admin/', include(admin.site.urls)),
      url(r'', include ('content.urls')),
      url(r'^redactor/', include('redactor.urls')),
  ]
  
  from django.conf.urls import patterns
  from django.contrib.staticfiles.urls import staticfiles_urlpatterns
  
  urlpatterns += staticfiles_urlpatterns()
  </code></pre>
  
  <p>settings.py:</p>
  
  <pre><code>INSTALLED_APPS = (
      'content',
      'django.contrib.admin',
      'django.contrib.auth',
      'django.contrib.contenttypes',
      'django.contrib.sessions',
      'django.contrib.messages',
      'django.contrib.staticfiles',
      'redactor',
      'pure_pagination',
      'django_cleanup',
      'image_cropping',
      'easy_thumbnails',
  )
  
  from easy_thumbnails.conf import Settings as thumbnail_settings
  THUMBNAIL_PROCESSORS = (
      'image_cropping.thumbnail_processors.crop_corners',
  ) + thumbnail_settings.THUMBNAIL_PROCESSORS
  
  STATIC_ROOT = os.path.join(BASE_DIR, "static/")
  
  STATIC_URL = '/content/static/'
  
  STATICFILES_FINDERS = ( 
      'django.contrib.staticfiles.finders.FileSystemFinder',
      'django.contrib.staticfiles.finders.AppDirectoriesFinder',
      'django.contrib.staticfiles.finders.DefaultStorageFinder',
  )
  
  STATICFILES_DIRS = (
      # Put strings here, like "/home/html/static" or "C:/www/django/static".
      # Always use forward slashes, even on Windows.
      # Don't forget to use absolute paths, not relative paths.
      os.path.join(
          os.path.dirname(__file__),
      ),
      "C:/Work/Snejana/magazine31.01.2016/content/static/upload_images",
      "C:/Work/Snejana/magazine31.01.2016/content/static",
      "C:/Work/Snejana/magazine31.01.2016",
  )
  </code></pre>
  
  <p>one model from content/models.py:</p>
  
  <pre><code>class Author(models.Model):
  
      class Meta:
          verbose_name = 'Автора'
          verbose_name_plural = 'Авторы'
  
      author_name              = models.CharField(max_length=200, verbose_name=u'Имя автора')
      regalias                 = models.CharField(max_length=200, blank=True, verbose_name=u'Регалии')
      description              = RedactorField(blank=True,
                                               verbose_name=u'Описание автора',
                                               redactor_options={'lang': 'en', 'focus': 'true'},
                                               upload_to='content/static/upload_images/',
                                               allow_file_upload=True,
                                               allow_image_upload=True)
      photo_full               = models.ImageField(upload_to="content/static/upload_images/",
                                                   verbose_name=u'Фото',
                                                   default=None,
                                                   blank=True,
                                                   null=True)
      photo_thumbnail          = models.ImageField(upload_to="content/static/upload_images/",
                                                   verbose_name=u'Фото маленькое',
                                                   default=None,
                                                   blank=True,
                                                   null=True)
      publications_of_author   = models.ForeignKey('Publication', blank=True, null=True, verbose_name=u'Публикации автора')
      cropping1 = ImageRatioField('photo_full', '600x400')
      cropping2 = ImageRatioField('photo_thumbnail', '100x80')
  </code></pre>
  
  <p>And last one, admin.py:</p>
  
  <pre><code>class AuthorAdmin(ImageCroppingMixin, admin.ModelAdmin):
      fieldsets = [
          ('Информация об авторе', {'fields': ['author_name', 'description', 'photo_full', 'photo_thumbnail','cropping1', 'regalias'], 'classes': ['collapse']}),
      ]
      readonly_fields = ('photo_thumbnail',)
      inlines = [AuthorsPublicationsInline]
  
      class Media:
          js = ['http://code.jquery.com/jquery-latest.min.js', 'js/collapsed_stacked_inlines.js',]
  </code></pre>