How to use the rhea.rpc_client function in rhea

* Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
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 * See the License for the specific language governing permissions and
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var container = require('rhea');
//a client through which requests can be invoked can be created via
//the container:
var client = container.rpc_client('amqp://localhost:5672/examples');
//to make a request, the call() method can be used directly, passing
//in the name, the arguments and a callback through which to be
//notified of the result:
client.call('fib', 5, function(result) { console.log('fib(5) => ' + result); });
//alternatively you can define a named function on the client:
client.define('fib');
//and then call that function, again passing in arguments and a callback:
client.fib(10, function(result) { console.log('fib(10) => ' + result); });

client.define('get');
client.define('put');
//if there are multiple arguments, they should be passed as a single
//object:
client.put({key:'foo', value:'bar'}, function() { console.log('Put item in remote map'); } );
client.get('foo', function(result) { console.log('Retrieved ' + result +' from remote map'); client.close(); } );
//(when the client is no longer needed, it can be closed)