all: remove x/crypto/acme copy; move up cmd/acme

Now that golang.org/x/crypto/acme is public,
there's no reason to keep the copy of the package here.

So, we only left with command line tool: move up to the root.
Go-gettable binary can now be built with:

    go get -u github.com/google/acme

README.md

@@ -1,21 +1,16 @@
 # acme
 
-ACME-compliant Go client library and a command line tool. Neither has 3rd party dependencies.
-Also, see https://letsencrypt.org.
+A simple command line tool to manage TLS certificates with ACME-compliant CAs,
+which has no third party depedencies.
 
-Contents of this repo:
-
-* `/` - ACME client Go package. See [godoc for acme package](https://godoc.org/github.com/google/acme).
-  The package has been imported to golang.org/x/crypto/acme/internal/acme. I will keep
-  github.com/google/acme package mirroring crypto/acme/internal/acme until it becomes exported
-  as `golang.org/x/crypto/acme`.
-* `/cmd/acme/` - cli tool, similar to the official `letsencrypt`.
+If you're looking for a package to import in your program, `golang.org/x/crypto/acme`
+or `golang.org/x/crypto/acme/autocert` is what you'll want instead.
 
 *This package is a work in progress and makes no API stability promises.*
 
-## command line tool usage
+## Usage
 
-Quick install with `go get -u github.com/google/acme/cmd/acme`.
+Quick install with `go get -u github.com/google/acme`.
 
 1. You need to have a user account, registered with the CA. This is represented
   by an RSA private key.
@@ -80,3 +75,5 @@ Quick install with `go get -u github.com/google/acme/cmd/acme`.
 ## License
 
 (c) Google, 2015. Licensed under [Apache-2](LICENSE) license.
+
+This is not an official Google product.

cmd/acme/cert.go → cert.go

@@ -25,9 +25,8 @@ import (
 	"path/filepath"
 	"time"
 
+	"golang.org/x/crypto/acme"
 	"golang.org/x/net/context"
-
-	"github.com/google/acme"
 )
 
 var (

cmd/acme/config.go → config.go

@@ -28,7 +28,7 @@ import (
 	"strings"
 	"text/tabwriter"
 
-	"github.com/google/acme"
+	"golang.org/x/crypto/acme"
 )
 
 const (

cmd/acme/config_test.go → config_test.go

@@ -16,7 +16,7 @@ import (
 	"reflect"
 	"testing"
 
-	"github.com/google/acme"
+	"golang.org/x/crypto/acme"
 )
 
 func TestConfigReadWrite(t *testing.T) {

cmd/acme/reg.go → reg.go

@@ -17,9 +17,8 @@ import (
 	"strings"
 	"time"
 
+	"golang.org/x/crypto/acme"
 	"golang.org/x/net/context"
-
-	"github.com/google/acme"
 )
 
 var (

cmd/acme/update.go → update.go

@@ -16,9 +16,8 @@ import (
 	"path/filepath"
 	"time"
 
+	"golang.org/x/crypto/acme"
 	"golang.org/x/net/context"
-
-	"github.com/google/acme"
 )
 
 var (

vendor/vendor.json

@@ -0,0 +1,13 @@
+{
+	"comment": "",
+	"ignore": "",
+	"package": [
+		{
+			"checksumSHA1": "Z+5Zyn58FeBHRkwQWC2SotL9cUo=",
+			"path": "golang.org/x/crypto/acme",
+			"revision": "97c09c959785e78cf1218e4abc17845d0f0948e6",
+			"revisionTime": "2016-09-12T10:18:32Z"
+		}
+	],
+	"rootPath": "github.com/google/acme"
+}

cmd/acme/who.go → who.go

@@ -16,9 +16,8 @@ import (
 	"path/filepath"
 	"time"
 
+	"golang.org/x/crypto/acme"
 	"golang.org/x/net/context"
-
-	"github.com/google/acme"
 )
 
 var (