The chromedriver is platform specific, will either need to package all of them or just do the same unreliable download, and even with packaging all them we will need to do platform detection etc

We still need to add android / ios, I also wanna run the tests against pouchdb-server so beginning to think about splitting these out into seperate projects, I think it will be good enough for /pouchdb/ to test firefox (and safari if / when we get it working)