dist: include js directory in misc/tour in binary distros
dist: include js directory in misc/tour in binary distros

R=campoy, dsymonds
CC=golang-dev
https://codereview.appspot.com/8564043

h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang