C: add Andres Erbsen (Google CLA)

LGTM=bradfitz, minux
R=bradfitz, minux
CC=golang-codereviews
https://codereview.appspot.com/119540043
go/build: add go1.4 tag.

LGTM=bradfitz
R=bradfitz
CC=golang-codereviews
https://codereview.appspot.com/138000044
net: fix misleading package comment example

Fixes Issue 8607

LGTM=r
R=r
CC=golang-codereviews
https://codereview.appspot.com/146470043
crypto/x509: accept CRLs without an expiry.

RFC5280 says that the nextUpdate field is optional.

Fixes issue 8085.

R=bradfitz
CC=golang-codereviews
https://codereview.appspot.com/149770044