[release-branch.go1.4] cmd/go: document import path checking

LGTM=adg
R=adg
CC=golang-codereviews
https://golang.org/cl/189760043
[release-branch.go1.4] [release-branch.go1.4] misc/cgo/test: skip test8694 on ARM.

««« CL 185130043 / 586738173884
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

»»»

LGTM=minux
R=golang-codereviews, minux, bradfitz
CC=golang-codereviews
https://golang.org/cl/188870043
[release-branch.go1.4] [release-branch.go1.4] doc: update contribution guidelines

LGTM=minux, adg, rsc
R=rsc, r, dsymonds, minux, bradfitz, adg, dave, iant
CC=golang-codereviews
https://golang.org/cl/185190043
[release-branch.go1.4] [release-branch.go1.4] doc: scrub references to code.google.com

These are the references that affect current Go users.
I left intact references in older release notes;
we can figure out what to do with them later.

LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/186140043
[release-branch.go1.4] api: create go1.4.txt

I read through and vetted these but others should look too.

LGTM=bradfitz, adg
R=r, minux, bradfitz, adg
CC=adg, golang-codereviews, gri, iant
https://golang.org/cl/182560043
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
go1.4

LGTM=bradfitz, minux, dsymonds
R=rsc, bradfitz, iant, dsymonds, minux
CC=golang-codereviews
https://golang.org/cl/188920043