let 'react-native bundle' support platform option.

react-native bundle --platform android --minify

local-cli/bundle.js

@@ -5,12 +5,18 @@ var chalk = require('chalk');
 var blacklist = require('../packager/blacklist.js');
 var ReactPackager = require('../packager/react-packager');
 
-var OUT_PATH = 'ios/main.jsbundle';
-var URL_PATH = '/index.ios.bundle?dev=';
+var OUT_PATH = {
+  android: 'android/app/src/main/assets/index.android.bundle',
+  ios: 'ios/main.jsbundle'
+};
+var URL_PATH = {
+  android: '/index.android.bundle?platform=android&dev=',
+  ios: '/index.ios.bundle?platform=ios&dev='
+};
 
 function getBundle(flags) {
-
-  var outPath = flags.out ? flags.out : OUT_PATH;
+  var platform = flags.platform ? flags.platform : 'ios';
+  var outPath = flags.out ? flags.out : OUT_PATH[platform];
 
   var projectRoots = [path.resolve(__dirname, '../../..')];
   if (flags.root) {
@@ -30,10 +36,10 @@ function getBundle(flags) {
     transformModulePath: require.resolve('../packager/transformer.js'),
     assetRoots: assetRoots,
     cacheVersion: '2',
-    blacklistRE: blacklist('ios'),
+    blacklistRE: blacklist(platform),
   };
 
-  var url = flags.url ? flags.url.replace(/\.js$/i, '.bundle?dev=') : URL_PATH;
+  var url = flags.url ? flags.url.replace(/\.js$/i, '.bundle?dev=') : URL_PATH[platform];
   url = url.match(/^\//) ? url : '/' + url;
   url += flags.dev;
 
@@ -66,6 +72,7 @@ function showHelp() {
     '  --assetRoots\t\tspecify the root directories of app assets',
     '  --out\t\tspecify the output file',
     '  --url\t\tspecify the bundle file url',
+    '  --platform\t\tspecify the platform(android/ios)',
   ].join('\n'));
   process.exit(1);
 }
@@ -77,6 +84,7 @@ module.exports = {
       dev: args.indexOf('--dev') !== -1,
       minify: args.indexOf('--minify') !== -1,
       root: args.indexOf('--root') !== -1 ? args[args.indexOf('--root') + 1] : false,
+      platform: args.indexOf('--platform') !== -1 ? args[args.indexOf('--platform') + 1] : false,
       assetRoots: args.indexOf('--assetRoots') !== -1 ? args[args.indexOf('--assetRoots') + 1] : false,
       out: args.indexOf('--out') !== -1 ? args[args.indexOf('--out') + 1] : false,
       url: args.indexOf('--url') !== -1 ? args[args.indexOf('--url') + 1] : false,