chore(travis): let's give BrowserStack a try

WIP: squash

WIP: squash

WIP: squash

WIP: squash again

WIP: show the readfile path

WIP: xxx

WIP: another

WIP: why?

WIP: more

WIP: I'm getting angry

WIP: omg

WIP: add log

WIP: i hope the last one

WIP: do not start tunnel in karma launcher

WIP: cleanup a bit