C: add Carl Shapiro (Google CLA).

R=golang-dev, bradfitz
CC=golang-dev
https://codereview.appspot.com/7132049
testing: catch panicking example and report, just like tests

Fixes issue 4670.

R=rsc
CC=golang-dev
https://codereview.appspot.com/7148043
html/template: remove noescape support

This was never documented or properly implemented.

Fixes issue 3528.

R=mikesamuel, rsc
CC=golang-dev
https://codereview.appspot.com/7142048