increase highr and markdown versions since they have been released to CRAN
do not create png here; it may not work on glimmer
roxygenize
forgot to add Weicheng Zhu to the author of rocco()
improve doc of opts_chunk to address confusions like http://stackoverflow.com/q/17910380/559676
factor out tools::vignetteEngine() to vig_engine()
update existing packages before installing the devel version
closes #526: deprecate stop_on_error; use error=FALSE is you want to stop on error (#571)
rename the argument stop_on_error to error in inline_exec()
closes #571: use the keep_warning and keep_message arguments in evaluate()
roxygenize
a note about the news
update test: error=FALSE means errors should stop R
include=FALSE should indicate error=FALSE; you cannot produce an error and hide it
increase evaluate version dependency
bump version