### Please describe the problem.
When running importfeed on gitminutes <http://feeds.gitminutes.com/gitminutes-podcast> git-annex interprets the extension as "_mp3" rather than ".mp3" which means that renaming is needed for various audio players to accept the files.

### What steps will reproduce the problem?
git annex importfeed http://feeds.gitminutes.com/gitminutes-podcast --fast

### What version of git-annex are you using? On what operating system?
git-annex version: 4.20130802
build flags: Assistant Webapp Pairing Testsuite S3 WebDAV Inotify DBus XMPP
local repository version: 3
default repository version: 3
supported repository versions: 3 4
upgrade supported from repository versions: 0 1 2

on Debian Sid

> Already fixed in git. [[done]] --[[Joey]]