Fix memory leak when init_asio produces an error (develop branch) #454
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Version of #453 on the develop branch. Description copied from there:
Currently the init_asio functions that don't use an external io_service will leak the memory if an error is generated. This uses a smart pointer to temporarily hold the new io_service until it is confirmed the function has completed successfully and ownership taken.
Couldn't use a unique_ptr because this wouldn't work with non-C++11 systems. Couldn't use shared_ptr because it has no release() method.