the rgl author field is messy for LaTeX now
kable() allows customization of the top rule and bottom rule in latex tables
if a chunk is not evaluated, there must be no objects created
allow customization of vertical rules
add an empty line before the table; this is to make sure hook_movecode{} works well
make sure there is a new line even if toprule is NULL
show the message only when the code is evaluated in foreign engines
discard anything after <<>>= in Rnw, per suggestion of Michael Friendly
clearly this is a bug: should use escape_html when output format is html
use the latest version of mathjax
clean latex aux files
clean up andre's highlight inside the source hook of latex

actually the results are not heavily cleaned up as before, since they are not put in the alltt environment any more
bump version