add HttpStatusCode plugin

https://github.com/jugyo/SublimeHttpStatusCode
![Screenshot](https://a248.e.akamai.net/camo.github.com/6dd7021e3bda874448d8e292e72b3e77f171b24b/687474703a2f2f692e696d6775722e636f6d2f4b336e315337532e706e67)