exp: delete all packages except norm
They are moving to code.google.com/p/go.exp.
See also https://codereview.appspot.com/7463043

R=golang-dev, minux.ma
CC=golang-dev
https://codereview.appspot.com/7456047
misc/dashboard/app: make the builders test go.talks and go.exp

R=golang-dev, r
CC=golang-dev
https://codereview.appspot.com/7419048