travis: Test against Go 1.6
travis: Test against Go 1.6

aarzilli/delve,go-delve/delve,dr2chase/delve,dr2chase/delve,alexbrainman/delve,visualfc/delve,dlsniper/delve,dr2chase/delve,dlsniper/delve,derekparker/delve,ggndnn/delve,derekparker/delve,ggndnn/delve,ggndnn/delve,dlsniper/delve,go-delve/delve,aarzilli/delve,alexbrainman/delve,aarzilli/delve,derekparker/delve,visualfc/delve,go-delve/delve,aarzilli/delve,alexbrainman/delve,go-delve/delve,visualfc/delve,go-delve/delve