add README as an introduction
a more comprehensive introduction
a more accurate description of cache
tweak README; move features to homepage
put up the package to GitHub
add .gitignore
ignore knit-all.R as well
change the option name out.type to render.to
a new option fig.low to remove plots caused by low-level plotting commands
put the total number of plots in options$plot.num and remove options$single
if current plot number is 0, it means there is only one plot in this chunk, so no plot number added to prefix
results from chunk hook is cached too, i.e not only the results inside chunk
correct pattern for header.begin and document.begin
alignment is applied on plots only (instead of on the chunk); \hfill{} can avoid the annoying large space caused by \end{center}
default digits to 4 and width to 70
no need to use screen device -- just need to enable plot recording
add hadley as a contributor; the initial design was borrowed from his decumar
need to open a device before using dev.control()
use results=format, asis, hide; close #5
fix buglet