title: I not understand how use es6 modules with typescript 2
body: <p>Please, help me, i not understand how use es6 modules in TS. 
  For example:</p>
  
  <p><strong>I trying import ext.class to class1.ts.</strong></p>
  
  <pre><code>class1.ts
  import ExtClass from "./ext.class";
  class Class1 {
      constructor(){
          console.log(new ExtClass().title)
          console.log("Work")
      }
  }
  new Class1();
  </code></pre>
  
  <p><strong>Its exporting class</strong></p>
  
  <pre><code>ext.class.ts
  class ExtClass {
      public title: string = "ExtClass work";
  }
  export default ExtClass
  
  package.json
  {
    "name": "ts_def",
    "version": "0.0.0",
    "license": "MIT",
    "private": true,
    "scripts": {
      "start": "tsc &amp;&amp; concurrently \"tsc -w\" \"lite-server\" ",
      "lite": "lite-server"
    },
    "dependencies": {
      "core-js": "^2.4.1",
      "ts-helpers": "^1.1.1"
    },
    "devDependencies": {
      "@types/jasmine": "^2.2.30",
      "@types/node": "^6.0.42",
      "codelyzer": "~0.0.26",
      "ts-node": "1.2.1",
      "tslint": "3.13.0",
      "typescript": "2.0.2",
      "concurrently": "^3.0.0",
      "lite-server": "^2.2.2"
    }
  }
  tsconfig.json
  {
    "compilerOptions": {
      "declaration": false,
      "emitDecoratorMetadata": true,
      "experimentalDecorators": true,
      "lib": ["es6", "dom"],
      "mapRoot": "./",
      "module": "es6",
      "moduleResolution": "node",
      "outDir": "../dist/out-tsc",
      "sourceMap": true,
      "target": "es6",
      "typeRoots": [
        "../node_modules/@types"
      ]
    }
  }
  </code></pre>
  
  <p>In result i recieve <strong>Unexpected token import</strong> in CLI and browser. Please, say me, whats wrong?</p>