Asynchronous HTTP client with promises.

Example usage: compute multiple HTTP requests in parallel, using fetch

<?php
$http = new Gt\Fetch\Http();
// Rather than creating the request now, `fetch` returns a Promise, 
// for later resolution with the BodyResponse.
$http->fetch("http://example.com/api/something.json")
->then(function(BodyResponse $response) {
// The first Promise resolves as soon as a response is received, even before
// the body's content has completed downloading.
	if(!$response->ok) {
		echo "Looks like there was a problem. Status code: "
			. $response->getStatusCode() . PHP_EOL;
		return null;
	}
// Within this Promise callback, you have access to the body stream, but
// to access the contents of the whole body, return a new Promise here:
 return $response->json();
})
->then(function(Json $json) {
// The second Promise resolves once the whole body has completed downloading.
 echo "Got JSON result length "
 	. count($json->results)
 	. PHP_EOL;
// Notice that type-safe getters are available on all Json objects:
 echo "Name of first result: "
 	. $json->results[0]->getString("name")
 	. PHP_EOL;
});
// A third request is made here to show a different type of body response:
$http->fetch("http://example.com/something.jpg")
->then(function(BodyResponse $response) {
 return $response->blob();
})
->then(function($blob) {
 echo "Got JPG blob. Saving file." . PHP_EOL;
 file_put_contents("/tmp/something.jpg", $blob);
});
// Once all Promises are registered, all HTTP requests can be initiated in
// parallel, with the callback function triggered when they are all complete. 
$http->all()->then(function() {
 echo "All HTTP calls have completed!" . PHP_EOL;
});

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