no longer uses the page option d3: true/false, since there has only been one example on this
stop_on_error has been deprecated, use error=FALSE instead
rgl starts warning against fonts now
update sessionInfo()
I do not really remember why the number of frames has increased by 1...
wrap lines
for admins
Merge pull request #12 from yulijia/gh-pages

merge files from branch draft, pull request for new articles
the latest version of knitr uses knitr.width instead of KNITR_WIDTH now
axis
update the context