add boto storage utility class

fbox/utils/__init__.py

@@ -0,0 +1,2 @@
+# coding: utf-8
+from __future__ import absolute_import, unicode_literals

fbox/utils/s3utils.py

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+"""
+Custom S3 storage backends to store files in subfolders.
+Use this backend with the boto storage app.
+"""
+
+from storages.backends.s3boto import S3BotoStorage
+
+
+MediaRootS3BotoStorage = lambda: S3BotoStorage(location='media')
+
+
+class StaticRootS3BotoStorage(S3BotoStorage):
+    location = 'static'
+    reduced_redundancy = True