Merge pull request #605 from krlmlr/master

also check against R-devel from Michael Rutter's PPA
allow spaces in the chunk header; closes #606
strip off possible chunk options in chunk headers for read_chunk()

eventually we should be able to just read chunk options as well
add link to the book
maybe > just works? I do not understand dd

dist-upgrade may just be upgrade
fixes #592 again for the speed issue: str_split() is significantly slower than strsplit(), not surprising, though
now I know why dd was used (sudo does not work on >); but tee can be used as well
paste source lines together before wrapping them in <pre>

fixes the bug reported at http://stackoverflow.com/q/18992260/559676
bump version
R HTML uses more info in opts_knit$get('header'), per request of Erich Neuwirth
a cosmetic change and roxygenize
Revert "closes #601: results='asis' implies comment=NA"

This reverts commit 7a89374219ff5fd4823a9d2ce951fac21ddc6018.

results='asis' will affect warnings/messages output as well
bump version
rename .Rmarkdown/.Rmkd vignettes to .Rmd, since the R 3.0.1 bug has been fixed (#578)
tweak contents of docco vignettes
reveal the top secret about the docco-classic vignette
rm local copies of highlight.js for knit_rd()
remove highlight.js and css from the shiny app; use the online version instead
rename assets to www, so there is no need to addResourcePath()
sync with framed.sty TeXLive 2012