misc/cgo/test: skip test8694 on ARM.

LGTM=dave, bradfitz, rsc
R=golang-codereviews, dave, bradfitz, rsc
CC=golang-codereviews
https://golang.org/cl/185130043
misc/makerelease: handle git sub-repositories

Also: checkout sub-repos from Mercurial manually
instead of using "go get". (for the 1.4 release)

LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/190720043
doc: remove TODO from go1.4 release notes

LGTM=bradfitz
R=iant, rsc, bradfitz
CC=golang-codereviews
https://golang.org/cl/191750043
doc: document go1.4

LGTM=bradfitz
R=rsc, bradfitz
CC=golang-codereviews
https://golang.org/cl/189810043
doc: tweak Go 1.4 release notes

LGTM=dave, dsymonds
R=golang-codereviews, dave, dsymonds
CC=golang-codereviews
https://golang.org/cl/184350043