do not disable mathjax; simply let it fail when offline
add the author and date fields
V -> v
we can show the code here: to put two images side by side, we have to use fig.show='hold'
the size of the default bootstrap/jquery is non-trivial, so explain it
add a few more examples
center these elements on the page: body, the title block (div#header), tables, and figures with captions (in case of fig_caption: yes)
thicker lines for table header
remove vertical lines in tables, and use the striped style for rows
more spacing for cells
the vignette engine should be rmarkdown instead of knitr
add more space to the left and right of body
Merge pull request #239 from rstudio/feature/tweak-vignette

Tweak html_vignette