Merge pull request #96 from pinepain/master

Fix segfault with AMQPConnection::setVhost
Update amqp_exchange.c

Wrong exception message.

```"Parameter must be an instance of AMQPConnection."```

should be

```"Parameter must be an instance of AMQPChannel."```
Merge pull request #98 from kinncj/patch-1

__construct exception
Added headers to AmqpExchange::publish attributes
Fixed a memleak in php_amqp_connect()
Merge pull request #102 from jpauli/fix-leak

Fixed a memleak in php_amqp_connect()
Merge pull request #101 from lyrixx/patch-1

Added headers to AmqpExchange::publish attributes