Accessing RMQMessage properties

[hasbean]

I need to access the correlationID of an incoming message, but for some reason it's missing from the header file.

I added this to RMQMessage.h

@property (nonatomic, readonly) NSArray *properties;

Works great so far.

[camelpunch]

I have a part-finished addition to Michael's commits that gives easier access via convenience methods.

[camelpunch]

Re-opening until aforementioned convenience work is in master.