[x/blog] go.blog: move cmd/blog to repo root

To be consistent with go.talks/present and go-tour/gotour. R=r CC=golang-dev https://golang.org/cl/13751044 X-Blog-Commit: 271841ab79d5163e1520e5b8eee5cf170bfe4aab
2013-09-19 11:11:31 +10:00 · 2013-09-19 11:11:31 +10:00 · 8ad4222c4b
--- a/blog/cmd/blog/appengine.go
+++ b/blog/cmd/blog/appengine.go
--- a/blog/cmd/blog/blog.go
+++ b/blog/cmd/blog/blog.go
--- a/blog/cmd/blog/local.go
+++ b/blog/cmd/blog/local.go
--- a/blog/cmd/blog/rewrite.go
+++ b/blog/cmd/blog/rewrite.go