use 15 jobs in the matrix; the problems of BTYD and R.rsp have been solved (the reason was that tk message box hang)
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