Convert detection logic into class + Remove unused sample files

src/index.ts

@@ -1,8 +1,6 @@
 import 'babel-polyfill';
-import { Greeter } from './greeter';
 // tslint:disable-next-line:ordered-imports
 import { fetchUnusedForkedRepos, runMain } from './gh';
-export * from './greeter';
 
 // tslint:disable-next-line:only-arrow-functions
 (function(currentWindow: Window) {
@@ -13,7 +11,6 @@ export * from './greeter';
 
   // assign Greeter to global
   const myWindow = currentWindow as any;
-  myWindow.Greeter = Greeter;
   myWindow.runMain = runMain;
   // we can use Greeter , execute following in console
   // var greet = new Greeter('myName');