Breaking change: Move bundle to private-cli

Summary: @​public

We need to start using the `private-cli` for the new asset system. Note this is a breaking change! People will have to upgrade their workflows/scripts to start using the new cli. Otherwise we'd need to build a thin adapter that is aware of both APIs which is something we;d like to avoid. The major API changes are:
  - API is now `entry-file` based instead of `url` based.
  - /s/--out/--bundle-output
  - /s/--out/--sourcemap-output

Also these parameters have no longer default values, you need to specify them. For instance, if you want to generate the sourcemaps you need to pass in the `--sourcemap-output` option

Lastly, additional project roots or asset roots need to be specified on the `rn-cli.config.js`.

Reviewed By: @frantic

Differential Revision: D2533877

fb-gh-sync-id: a45f9095fdf9442a9106ea7bb6a6b7f651d25273

local-cli/generator/templates/rn-cli.config.js

@@ -4,23 +4,20 @@ var blacklist = require('./node_modules/react-native/packager/blacklist');
 
 var config = {
   getProjectRoots() {
-    return this._getRoots();
+    return [__dirname];
   },
 
   getAssetRoots() {
-    return this._getRoots();
+    // speficy where to look for assets
+    return [];
   },
 
-  getBlacklistRE() {
-    return blacklist('');
+  getBlacklistRE(platform) {
+    return blacklist(platform);
   },
 
   getTransformModulePath() {
     return require.resolve('./node_modules/react-native/packager/transformer');
-  },
-
-  _getRoots() {
-    return [__dirname];
   }
 };