dashboard/app: tag 1.3 release
dashboard/app: tag 1.3 release

R=adg
TBR=adg
CC=golang-codereviews
https://codereview.appspot.com/102590043

karmakaze/go.tools,karmakaze/go.tools,karmakaze/go.tools,karmakaze/go.tools,karmakaze/go.tools