title: many Duplicate Identifier errors on testing type script application
body: <p>searching the whole morning for a solution... </p>
  
  <p>I use typescript on (node, npm, bower and gulp).
  On gulp serve / gulp test I got hundreds of same error message: </p>
  
  <pre><code>src\app\main\common\dialogs\collections\collections.controller.ts(1,8): error TS2300: Duplicate identifier 'IDialogService'.
  src\app\main\common\dialogs\createproject\createprojectdialog.controller.ts(1,8): error TS2300: Duplicate identifier 'ILogService'.
  src\app\main\common\dialogs\datasheet\create\controller.ts(1,8): error TS2300: Duplicate identifier 'IDialogService'.
  src\app\main\common\dialogs\decisor\controller.ts(1,8): error TS2300: Duplicate identifier 'IDialogService'.
  </code></pre>
  
  <p>my Compiler Options:</p>
  
  <pre><code>{
    "compilerOptions": {
      "module": "commonjs",
      "target": "es5",
      "sourceMap": true
    },
    "exclude": [
      "node_modules"
    ]
  }
  </code></pre>
  
  <p>Anyone who can give me a hint... ?</p>
  
  <p>regards <em>n00n</em></p>