an example of hook_scianimator() for http://stackoverflow.com/q/19833199/559676
there is already a 107; rename to 108
107 -> 108
temporarily ignore changes in 101-cache-levels; I need to figure out the problem some day
tidy=FALSE by default now; for these examples, I still use tidy=TRUE
no need to render_markdown() for the graphics device now
cache the graphviz example
use knit_child() so that most options are inherited from the parent document
a different hack for 033; perhaps I should just write the full name in the plot hook some day
cache the coffeescript example