Set the versions in package.json and React.podspec to 0.0.0-master

Summary:
The current versions in these files is 0.12.0, which is out of date. Better to claim no version than the wrong version, so this diff changes the versions to 0.0.0-master.

Release branches will still have the correct versions.
Closes https://github.com/facebook/react-native/pull/5241

Reviewed By: svcscm

Differential Revision: D2819277

Pulled By: javache

fb-gh-sync-id: 99d4682e5d1f571e241f306caf309b2944483909

React.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name                = "React"
-  s.version             = "0.15.0"
+  s.version             = "0.0.0-master"
   s.summary             = "Build high quality mobile apps using React."
   s.description         = <<-DESC
                             React Native apps are built using the React JS

npm-shrinkwrap.json

@@ -1,6 +1,6 @@
 {
   "name": "react-native",
-  "version": "0.12.0",
+  "version": "0.0.0-master",
   "dependencies": {
     "absolute-path": {
       "version": "0.0.0",

package.json

@@ -1,6 +1,6 @@
 {
   "name": "react-native",
-  "version": "0.12.0",
+  "version": "0.0.0-master",
   "description": "A framework for building native apps using React",
   "license": "BSD-3-Clause",
   "repository": {