URLShortener

User Stories:

1. I can pass a URL as a parameter and I will receive a shortened URL in the JSON response.
2. If I pass an invalid URL that doesn't follow the valid http://www.example.com format, the JSON response will contain an error instead.
3. When I visit that shortened URL, it will redirect me to my original link.

Example creation usage:

https://lit-peak-83363.herokuapp.com/new/http://www.google.com

Example creation output: {"original_url": http://www.google.com, "short_url": "KAAAAA" }

Usage: https://lit-peak-83363.herokuapp.com/KAAAAA

Will redirect to: http://www.google.com