Roberto,
Glad someone is watching master :)
I've been working on a new API for the next release as well as quite a bit of cleanup and simplification of the existing code. Part of that involves removing the Taxi API.
I have a rather large email drafted that I'll be sending out when I'm ready to actively engage the whole clj-webdriver community on the new design. If you or anyone else is interested in working on this with me in a more active role, I'd be happy to go into the progress so far over Google hangouts.
-Daniel