Not sure if it's because of the PHP version or what, but I had to load the driver with Channeldata as opposed to ChannelData, also the magic __autoload wasn't doing it for me either, had to use spl_autoload_register as well as fix passing arrays of directories. Forked and committed what worked for me (link below) but I am not sure if it's isolated to my setup or what.
notacouch@98ed5eb
Let me know if I should do a pull request.
Really loving ChannelData now! Thank you so much.