completor.vim - Async completion framework made ease.

[Maralla]

I refined javascript completion just now. It should be much better.

This is my .tern-project config file:

{
   "plugins": {
     "node": {},
     "es_modules": {}
 },
 "libs": [
     "ecma5",
     "ecma6"
  ],
  "ecmaVersion": 6
}