uamqp v0.1.0rc1

• Fixed import error in async receiver.
• Exposed sender/receiver destroy function.
• Moved receiver.open on_message_received argument to constructor.
• Removed sasl module and moved internal classes into authentication module.
• Added encoding parameter everywhere where strings are encoded.
• Started documentation.
• Updated uAMQP-C to 1.2.4 and C Shared Utility to 1.1.4 (includes fix for issue #12).
• Fixed return type of MgmtOperation.execute - now returns ~uamqp.Message.
• Made AMQP connection/session/sender/receiver types in a client overridable.
• Added debug trace to management operations.
• Fixed error in management callback on failed operation.
• Default AMQP encoding of bytes is now a String type and a bytearray is a Binary type.
• Added AMQP Array type and fixed Long type range validation.
• Added header argument to Message and BatchMessage for setting a MessageHeader.
• Fixed MessageHeader attribute setters.