Update transpilation example to Babel 6 and remove system.js

samples/misc/ES2015Transpilation/transpilation.js

@@ -4,6 +4,7 @@ var babelCore = require('babel-core');
 module.exports = function(cb, physicalPath, requestPath) {
     var originalContents = fs.readFileSync(physicalPath);
     var result = babelCore.transform(originalContents, {
+        presets: ['es2015'],
     	sourceMaps: 'inline',
     	sourceFileName: '/sourcemapped' + requestPath
     });