check if markdown is installed before calling markdownToHTML()
roxygenize
check if markdown was installed before testing image_uri()
fixed #465: when eval=FALSE and echo is numeric, should use `echo` on `code` instead of the list `res`
bump version
restore global environment on exit of knit()
cosmetic
use ? in regexp for non-greedy matching: http://stackoverflow.com/q/14360296/559676
empty inline expressions are no longer recognized (.* was changed to .+)
similarly ref.chunk was changed from .* to .+ because empty reference <<>> does not make sense
bump version
only restore default output hooks on exit of knit(); other hooks will be preserved
when child is not NULL and eval=FALSE, immediately return ''
cosmetic
move ref.chunk out from parse_chunk() to be an argument
n is not used anywhere, so do not need to create it
comment out code in purl() when eval=FALSE
assign params$eval to ev
do not pop up the dialog box when on CRAN
bump version and release a patch version to CRAN due to the problems in doRNG and RcppOctave