yargs add .argv to fix CLI

Summary:
CLI was not working:
- setup now needs an object with arguments passed
- the `argv` property is needed by `yargs` to work in node: http://yargs.js.org/docs/#api-argv

Reviewed By: passy

Differential Revision: D13991958

fbshipit-source-id: a9432b27f3d4d24c1e43014b8fb87dca806a6e8a

headless/index.js

@@ -47,7 +47,7 @@ yargs
     startFlipper,
   )
   .version(global.__VERSION__)
-  .help();
+  .help().argv; // http://yargs.js.org/docs/#api-argv
 
 function startFlipper({
   dev,
@@ -87,7 +87,7 @@ function startFlipper({
   // needs to be required after WebSocket polyfill is loaded
   const devToolsEnhancer = require('remote-redux-devtools').default;
 
-  setup();
+  setup({});
   const store = dev
     ? createStore(
         reducers,