review: move 'review' command to 'git-review' sub-directory

If 'git-review' is in your path, 'git review' will invoke 'git-review'.

Change-Id: I0f1134776dbbf4bd5c7619248b69d1b5ba884162
Reviewed-on: https://go-review.googlesource.com/1160
Reviewed-by: Rob Pike <r@golang.org>
diff --git a/README b/README
index dc7591d..c79702c 100644
--- a/README
+++ b/README
@@ -1,3 +1,3 @@
 The review tool is a command-line tool for working with Gerrit.
 It wraps git and handles a lot of the mess.
-See "review help" for instruction.
+See "git-review help" for instruction.
diff --git a/api.go b/git-review/api.go
similarity index 100%
rename from api.go
rename to git-review/api.go
diff --git a/branch.go b/git-review/branch.go
similarity index 100%
rename from branch.go
rename to git-review/branch.go
diff --git a/change.go b/git-review/change.go
similarity index 100%
rename from change.go
rename to git-review/change.go
diff --git a/hook.go b/git-review/hook.go
similarity index 100%
rename from hook.go
rename to git-review/hook.go
diff --git a/mail.go b/git-review/mail.go
similarity index 100%
rename from mail.go
rename to git-review/mail.go
diff --git a/pending.go b/git-review/pending.go
similarity index 100%
rename from pending.go
rename to git-review/pending.go
diff --git a/revert.go b/git-review/revert.go
similarity index 100%
rename from revert.go
rename to git-review/revert.go
diff --git a/review.go b/git-review/review.go
similarity index 96%
rename from review.go
rename to git-review/review.go
index c5ca2f8..efedddd 100644
--- a/review.go
+++ b/git-review/review.go
@@ -10,10 +10,10 @@
 // TODO(adg): print changed files on review sync
 // TODO(adg): translate email addresses without @ by looking up somewhere
 
-// Command review provides a simple command-line user interface for
+// Command git-review provides a simple command-line user interface for
 // working with git repositories and the Gerrit code review system.
-// See "review help" for details.
-package main // import "golang.org/x/review"
+// See "git-review help" for details.
+package main // import "golang.org/x/review/git-review"
 
 import (
 	"bytes"
diff --git a/sync.go b/git-review/sync.go
similarity index 100%
rename from sync.go
rename to git-review/sync.go