Style improvements to FlowableOperator (#517)
Style improvements to FlowableOperator (#517)

No functional changes.

* Use make_ref where possible instead of Reference<Foo>(new Foo(...)).

* Use Super where possible instead of FlowableOperator<D, U>::Subscription.

* M-x clang-format-buffer
phoad/rsocket-cpp,ReactiveSocket/reactivesocket-cpp,rsocket/rsocket-cpp,phoad/rsocket-cpp,ReactiveSocket/reactivesocket-cpp,alexmalyshev/rsocket-cpp,alexmalyshev/rsocket-cpp,ReactiveSocket/reactivesocket-cpp,alexmalyshev/rsocket-cpp,rsocket/rsocket-cpp,phoad/rsocket-cpp,rsocket/rsocket-cpp,phoad/rsocket-cpp,rsocket/rsocket-cpp,alexmalyshev/rsocket-cpp,phoad/rsocket-cpp