[0.40.0-rc.2] Bump version numbers

Summary:
We stopped using Yeoman in https://github.com/facebook/react-native/pull/10786

I almost forgot to remove the now-unused dependency :)

**Test Plan**

- Published react-native to Sinopia
- Ran `react-native init MyApp`
- The app was generated correctly
- The app's node_modules folder doesn't contain Yeoman

Reviewed By: cpojer

Differential Revision: D4291619

fbshipit-source-id: 44c1ef8035fa2d8c40d4e8c505207245e1a95d3c

React.podspec

@@ -4,7 +4,7 @@ package = JSON.parse(File.read(File.join(__dir__, 'package.json')))
 
 Pod::Spec.new do |s|
   s.name                = "React"
-  s.version             = package['version']
+  s.version             = "0.40.0-rc.2"
   s.summary             = package['description']
   s.description         = <<-DESC
                             React Native apps are built using the React JS

ReactAndroid/gradle.properties

@@ -1,4 +1,4 @@
-VERSION_NAME=1000.0.0-master
+VERSION_NAME=0.40.0-rc.2
 GROUP=com.facebook.react
 
 POM_NAME=ReactNative

local-cli/util/yarn.js

@@ -8,6 +8,7 @@
  */
 'use strict';
 
+const execSync = require('child_process').execSync;
 const fs = require('fs');
 const path = require('path');
 const semver = require('semver');

package.json

@@ -1,6 +1,6 @@
 {
   "name": "react-native",
-  "version": "1000.0.0",
+  "version": "0.40.0-rc.2",
   "description": "A framework for building native apps using React",
   "license": "BSD-3-Clause",
   "repository": {
@@ -191,9 +191,7 @@
     "ws": "^1.1.0",
     "xcode": "^0.8.9",
     "xmldoc": "^0.4.0",
-    "yargs": "^6.4.0",
-    "yeoman-environment": "1.5.3",
-    "yeoman-generator": "0.21.2"
+    "yargs": "^6.4.0"
   },
   "devDependencies": {
     "JSONStream": "1.2.1",
@@ -222,4 +220,4 @@
     "sinon": "^2.0.0-pre.2",
     "split": "1.0.0"
   }
-}
+}