Move the upload flag to the database, and use the database stored image size rather than going to s3.

storage/s3.py

@@ -171,12 +171,3 @@ class S3Storage(BaseStorage):
       path += '/'
     for key in self._s3_bucket.list(prefix=path):
       key.delete()
-
-  def get_size(self, path):
-    self._initialize_s3()
-    path = self._init_path(path)
-    # Lookup does a HEAD HTTP Request on the object
-    key = self._s3_bucket.lookup(path)
-    if not key:
-      raise OSError('No such key: \'{0}\''.format(path))
-    return key.size