Update manual for use with knitr and ggplot2

[tannenfreund87]

I am using the console output mode of tikzDevice to include the TikZ-output directly in my tex file. Because I'm using knitr and not Sweave, the example from the manual doesn't work:

\documentclass{article}
\usepackage{tikz}
  \begin{document}
    \begin{figure}[ht]
      \centering

<<inline,echo=FALSE,results='tex'>>=

require(tikzDevice)
tikz(console=TRUE,width=5,height=5)
  x <- rnorm(100)
  plot(x)
dummy <- dev.off()
@

    \caption{caption}
    \label{fig:inline}
  \end{figure}
\end{document}

I will get all the output in a verbatim-envirionment.

For the plot to show, I need to change results='tex' to results='asis'

For a ggplot2 graph I also need to use results='asis' and always end the chunk with dummy <- dev.off()

Could you update the documentation for the use with knitr?