4269af4da8
The initial commit to allow graphviz images in documentation used a sphinx extension relying on googlechart (which just sends the .dot files to a google API and let's them render it). It turns out google's implementation of the .dot renderer is quite out of date, and there's a better module we can include which doesn't rely on this third party service anyway. Change-Id: I2bd10dc68d1d108af6bbf7f0e3871642f294eb8c