add the 511 status code for network auth required
Add 428, 429 and 431 status codes from http://tools.ietf.org/html/rfc6585
Add 428, 429 and 431 status codes from http://tools.ietf.org/html/rfc6585
Merge branch 'master' of github.com:natmchugh/teapot

Conflicts:
	lib/Teapot/StatusCode.php
Merge pull request #5 from natmchugh/master

Add some status codes from RFC6585