2.0.0-rc1

A few breaking changes, have a look at the Todo sample for upgrade reference.

#279 - Re-write of channel management
#277 - Rename 'MandatoryCallback' to 'ReturnCallback'
#275 - Prohibit operation specific configuration to be used for unsupported operations
#274 - PublishConfirmException when doing RPC before publishing a message.
#272 - RequestAsync doesn't resume after broker restart (2.x)
#271 - Messages queued when the broker goes down in 2.x
#270 - Unexpected PublishConfirmExceptions with 2.x
#269 - Some typos contributed by (cortex93)
#268 - Polly Policies not Executing
#266 - Remove subscription for RPC request when queue name specified
#239 - Topology not recovering

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