Announcing php library for bitly api

I am not sure if anyone else has done it before, but I wrote a php library to bitly api. Bitly Api Php github repo is the place where you can get it.

Basic usage:

	`require("bitly_api.php");`
	`$bitly = new Bitly(array("login" => "yourlogin", "api_key" => "yourapikey"));`
	`# or to use oauth2 endpoints`
	`$bitly = new Bitly(array("access_token" => "youraccesstoken");`
	`$data = $bitly->shorten('http://www.google.com/');`

Currently, it only supports curl to make http queries. I might add php http later on.

Please try, test, comment & contribute.