fixed theoretical issue when deferredGet onSize() methods destructs t…

…he underlying channel object

the connection.close function was only waiting for synchronous calls …

…to complete, async calls that were waiting (after a synchronous) were still discarded, this has been fixed

renamed apple.h to endian.h because it turns out that it is also used…

… for linux systems, and removed double implemented ChannelImpl::get() function

fixed bug in channel.get() calls

basic.get is asynchronous until the entire body has been received, on…

…ly then subsequent messages are sent + first work in progress on implementing smarter buffers

BasicNack frame makes the consumer stop (dont know why) so we use the…

… BackReject message instead when there is no need to reject multiple messages

Updated README

Fix logic error in the array type

{auto} if connection.close() was called before the connection was set…

… up, the instructions that were called between setting up the connection and the call to close() were lost. This forced users to always use the onConnected() handler to wait for the first instruction to be sent. But this is not according to the library design, so now the instructions that are given before the close() will be executed too;

Channel::declareQueue() passive and durable flags were in conflict