project organization

```
index.js (entry point)
├─ lib/
│  ├─ filters/  (all of the filters that have been ported to javascript)
│  └─ utils.js  (common javascript utils that can be used by the helpers to reduce code)
└─ tests (unit tests)
```

All other folders/files in `lib/` are temporary. 

cc @tunnckoCore @doowb 