[release-branch.go1.4] doc: tidy up "Projects" page; add Go 1.4
[release-branch.go1.4] doc: tidy up "Projects" page; add Go 1.4

««« CL 182750043 / ffe33f1f1f17
doc: tidy up "Projects" page; add Go 1.4

LGTM=r
R=r
CC=golang-codereviews
https://golang.org/cl/182750043
»»»

TBR=r
CC=golang-codereviews
https://golang.org/cl/176350043

mapix/go,gomini/go-mips32,gomini/go-mips32,gomini/go-mips32,gomini/go-mips32,mapix/go,mapix/go,mapix/go,mapix/go,gomini/go-mips32,gomini/go-mips32,mapix/go,mapix/go,mapix/go,gomini/go-mips32,gomini/go-mips32