Although the package doesn't attempt to fully support ancient, version
3 messages, supporting v3 detached signatures is fairly easy and some
projects (in this case, Ubuntu) are using them for unknown reasons.
R=golang-dev, r
CC=golang-dev
https://golang.org/cl/14590043
Manual edits to README.
Moved from main Go repository, deleted Makefiles, ran gofix -r go1rename.
Tested with: go test code.google.com/p/go.crypto/...
R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/5564059