Move all sources under atom/.

atom/browser/default_app/main.js

@@ -0,0 +1,32 @@
+var app = require('app');
+var path = require('path');
+var optimist = require('optimist');
+
+// Quit when all windows are closed and no other one is listening to this.
+app.on('window-all-closed', function() {
+  if (app.listeners('window-all-closed').length == 1)
+    app.quit();
+});
+
+var argv = optimist(process.argv.slice(1)).boolean('ci').argv;
+
+// Start the specified app if there is one specified in command line, otherwise
+// start the default app.
+if (argv._.length > 0) {
+  try {
+    require(path.resolve(argv._[0]));
+  } catch(e) {
+    if (e.code == 'MODULE_NOT_FOUND') {
+      console.error(e.stack);
+      console.error('Specified app is invalid');
+      process.exit(1);
+    } else {
+      throw e;
+    }
+  }
+} else if (argv.version) {
+  console.log('v' + process.versions['atom-shell']);
+  process.exit(0);
+} else {
+  require('./default_app.js');
+}