Basic client for Opscode Chef Server API

Server Api: http://wiki.opscode.com/display/chef/Server+API

Examples:
// Connectiong
$api = new ChefServer("192.168.124.10",4000,'webserver', '/etc/chef/client.key');
// geting client list
var_dump( $api->get('/clients') );
// getting node list
var_dump( $api->get('/node') );
// fetch 'test' data bag
var_dump( $api->get('/data/test') );
// create 'test' data bag
$api->post('/data', array('name'=>'test'));
// insert into 'test' data bag
$api->post('/data/test', array('id'=>'test_id','somekey'=>'somevalue'));
// update a data bag item
$api->put('/data/test', 'test_id', array('id'=>'bla','somekey'=>'somenewvalue', 'newcol'=>'newvalue')) );
// delete a data bag item
$api->delete('/data/test', 'test_id');