Hi David,
For now, there is no documentation on how these tests are to be executed - you'll have to reverse engineer the Travis scripts: We're only switched to Travis very recently and this is still work in progress.
However, if there is any failure you do not understand, feel free to ask for help.
About the big screens, sonar-css showed up just yesterday (and not during the vote), because we only check the master's state and there were no new pushes made to it between August 11 and 24 (excluded).
Anyway, no worries - nothing is broken in the end, and we'll do better next time ;-)
Thanks again