a word about the testing
update bib
okay, ripley starts to warn against quartz() and win.metafile(); let me grDevices:: so that codetools::findGlobals() cannot find them
use the more natural getFromNamespace() instead of get()
changed some str_c() to paste(), str_replace() to sub(), str_detect() to grepl()
double quote to single quote
use knitr::knitr instead of knitr; closes #568
news about VignetteEngine{knitr::knitr} #568
deal with column alignment in markdown pipe tables
fortunately, both RStudio and Pandoc support PHP markdown tables
add options to knit_child() and fixes the problem in http://stackoverflow.com/q/17514055/559676
knitr is a project affiliated with FOAS now
do not import texi2pdf(), use tools:: instead, because users may not need this feature at all (e.g. markdown users)
roxygenize