I have no idea where these lines came from (I have tried my best to suppress boring output), so delete them using brutal force
yihui updated branch pkg/knitr Sat Oct  4 17:38:22 CDT 2014
yihui updated branch pkg/knitr Sun Oct  5 11:38:48 CDT 2014
yihui updated branch pkg/knitr Sun Oct  5 12:15:38 CDT 2014
yihui updated branch pkg/knitr Mon Oct  6 01:05:24 CDT 2014