use single entry point for both babel and traceur

Author: guybedford

index.js

@@ -0,0 +1,20 @@
+var System = require('./dist/es6-module-loader.src');
+
+System.transpiler = 'traceur';
+try {
+  System.paths.traceur = require.resolve('traceur/bin/traceur.js');
+}
+catch(e) {}
+try {
+  System.paths.babel = require.resolve('babel-core/browser.js');
+}
+catch(e) {}
+try {
+  System.paths.babel = System.paths.babel || require.resolve('babel/browser.js');
+}
+catch(e) {}
+
+module.exports = {
+  Loader: global.LoaderPolyfill,
+  System: System
+};

lib/index-babel.js

@@ -6,7 +6,8 @@ require('./_helper');
 
 require('regenerator/runtime');
 
-global.System = require('../lib/index-babel').System;
+global.System = require('../index').System;
+global.System.transpiler = 'babel';
 
 require('./system.spec');
 

lib/index-traceur.js

@@ -4,9 +4,7 @@ global.expect = require('expect.js');
 
 require('./_helper');
 
-global.System = require('../lib/index-traceur').System;
-
-System.parser = 'traceur';
+global.System = require('../index').System;
 
 require('./system.spec');