Add output of detected browser and version.
Add output of detected browser and version.

This makes it easier to see in Travis logs which version of the browser
was actually tested.

jan-ivar/adapter,xdumaine/adapter,calebboyd/adapter,harme199497/adapter,harme199497/adapter,shines/adapter,4lejandrito/adapter,calebboyd/adapter,Zauberstuhl/adapter,Acidburn0zzz/adapter,webrtc/adapter,webrtc/adapter,Acidburn0zzz/adapter,4lejandrito/adapter,Zauberstuhl/adapter,Zauberstuhl/adapter,shines/adapter,shines/adapter,jan-ivar/adapter,xdumaine/adapter,calebboyd/adapter,harme199497/adapter,Acidburn0zzz/adapter,4lejandrito/adapter