Add Settings api, and xpathCompression setting for Android

Same as last, time, you need to use my fork of wd.js to run the tests...
I can't rationalize adding dozens or hundreds of lines of code that's beyond your control and much of which you don't even use, all of which may be introducing bugs into your own project, if it's feasible to write your own.  I'm not opposed to all dependencies, obviously, but they shouldn't be adopted cavalierly.  They come at a very real cost, as we've seen, eg, with Winston.