Set content-types for stats; stop creating index file
Set content-types for stats; stop creating index file

The index file will be generated by
https://github.com/rufuspollock/s3-bucket-listing instead.

tobias/clojars-web,tobias/clojars-web,clojars/clojars-web,clojars/clojars-web,ato/clojars-web,ato/clojars-web,clojars/clojars-web,tobias/clojars-web