wire/cmd/wire: rename from gowire (google/go-cloud#217)

@cflewis and @bradfitz were right: drop the "go". It's cleaner.

README.md

@@ -11,10 +11,10 @@ initialization.
 
 ## Installing
 
-Install `gowire` by running the following:
+Install Wire by running:
 
 ```shell
-go get github.com/google/go-cloud/wire/cmd/gowire
+go get github.com/google/go-cloud/wire/cmd/wire
 ```
 
 ## Basics
@@ -156,19 +156,19 @@ used during code generation for that injector.
 Any non-injector declarations found in a file with injectors will be copied into
 the generated file.
 
-You can generate the injector by invoking `gowire` in the package directory:
+You can generate the injector by invoking Wire in the package directory:
 
 ```shell
-gowire
+wire
 ```
 
 Wire will produce an implementation of the injector in a file called
 `wire_gen.go` that looks something like this:
 
 ```go
-// Code generated by gowire. DO NOT EDIT.
+// Code generated by Wire. DO NOT EDIT.
 
-//go:generate gowire
+//go:generate wire
 //+build !wireinject
 
 package main
@@ -314,7 +314,7 @@ func injectFoo() Foo {
 
 It's important to note that the expression will be copied to the injector's
 package; references to variables will be evaluated during the injector
-package's initialization. `gowire` will emit an error if the expression calls
+package's initialization. Wire will emit an error if the expression calls
 any functions or receives from any channels.
 
 ### Cleanup functions