Stanford-Online/class2go — pull request #1339 by jrbl (2012-11-20 04:05:54+00:00)
Title: Filetype speedups

* Eliminate an S3 round-trip for filetype lookup
* Make icon assignment a constant-time operation

This is pulled against master; I'll push a change against prod in a minute, so it can be hotfixed if @sefk thinks it's worthwhile.