+ unit test for prefix hijacking
+ unit test for prefix hijacking

pombredanne/drf-to-s3,pombredanne/drf-to-s3,bodylabs/drf-to-s3,pombredanne/drf-to-s3,bodylabs/drf-to-s3,pombredanne/drf-to-s3,pombredanne/drf-to-s3,bodylabs/drf-to-s3,bodylabs/drf-to-s3,bodylabs/drf-to-s3