Sphinx html

Finally -- adds the ability to run Sphinx to the preview window.
I agree it does look odd, but I hestitate to hide it: the color is helpful (at least, to me). I often hide the log window unless the progress bar runs yellow (warnings) or red (errors), then look at the log again. So, the colors (green, yellow, red) do mean something. Can you think of some better or more intuitive way to display this?