rstudio/ggvis — pull request #134 by jjallaire (2014-04-07 13:14:41+00:00)
Title: use knitr chunk options for width and height

Knitr now passes the chunk options to knit_print and also does the computation of the output pixels (accounting for any fig.retina value). This change enables knit_print.ggvis to respect whatever fig.width and fig.height are set for the chunk it's being printed within.