Update the string that clears the console. (facebook#2071)

* Update the string that clears the console.

facebook#1914
I've tested it with Windows 10 and 7, node versions from ~5.0.0 up to 7.7.0.
Didn't managed to test it on 8 but it should be fine.

* Update windows string

Add windows specific string for clearing the console.

packages/react-dev-utils/clearConsole.js

@@ -8,9 +8,7 @@
 'use strict';
 
 function clearConsole() {
-  process.stdout.write(
-    process.platform === 'win32' ? '\x1Bc' : '\x1B[2J\x1B[3J\x1B[H'
-  );
+  process.stdout.write(process.platform === 'win32' ? '\x1B[2J\x1B[0f' : '\x1B[2J\x1B[3J\x1B[H');
 }
 
 module.exports = clearConsole;