automatically figure out which packages are broken and need to be re-installed, and also re-install with stdout if the previous installation failed
factor out require(quiet = TRUE)
see if travis_wait works (extend timeout to 20 minutes)
run R CMD javareconf for rJava and see if fixes the jvm-not-found problem
update branch Thu Oct  2 02:29:02 CDT 2014
update branch knitr Thu Oct  2 13:02:26 CDT 2014
update branch knitr Thu Oct  2 14:49:45 CDT 2014