Issue #7: Implement ProcessQueueClosure
Issue #7: Implement Server::QueryClosure
Issue #7: Implement Server::ShortTransactClosure
Implement ASYNC_MEMBER macro

This macro provides syntactic sugar: Instead of

Async::Callback<Res(Args..)>::make(T, &T::function)(t)

(which can get very long if the result and argument types
are long) you can simply use

ASYNC_MEMBER(t, &T::function)
Issue #7: Use Async::Callback in query()
Issue #7: Implement JsView::QueryClosure
Issure #7: Implement JsView::SequenceClosure
Issue #7: Implement JsView::InsertClosure
Issue #7: Implement JsView::RemoveClosure
Issue #7: Use Async::Callback in fetch()
Issue #7: Use Async::Callback for transactions