After updating my local install of Sphinx to 1.4, I get the following error in the build:
Because we specify -W on the sphinx-build line, we treat all warnings as errors the build stops here. Removing the -W allows the build to complete but results in 255 warnings where highlighting is being skipped as a result of a failure to parse the block. The full output of make html is here: https://paste.apache.org/DKOL
The temporary fix is to disable the -W option in the makefile. janl andywenk this is something you might want to think about for the RC2 release, though I suspect your local Sphinx is old enough that it's not running into the bug.
The right fix is to fix the code blocks so they work under Sphinx 1.4+. See for instance this diff of how another project fixed their warnings - it's mainly un-escaping some text since the parser expects no syntax errors in the block of text.
If no one else steps up by mid- next week I can look at this bug, but my time is booked until July 27th at the earliest.