add the encoding argument to pandoc() to fix the problem reported at http://stackoverflow.com/q/22198832/559676
roxygenize
remove the white spaces before \begin{document} when inserting the upquote package
fixes #752: now we treat the closing mark (e.g. @ or ```) as part of the code chunk, instead of the beginning of a text chunk

if you use version control tools, you will see a couple of blank lines removed

this is actually a problem from day one once asked by @dmbates: https://groups.google.com/d/msg/knitr/Pf8yx7My01s/upl3QiqE2xcJ
bump version