This shows how to dynamically generate a plot in R+ggplot2, then embed
it into a latex document, and compile it to pdf, all with proper
autodependencies.
I also cleaned up the installation section and added links to various
competing redo implementations.
The new README.md is basically just link to the docs on
readthedocs.org, and a link to the mailing list.
These docs need a *lot* more work, but this is enough of an improvement
that I'll commit it anyway for now.
