Add the wording of each constructors.
Add the wording of the destructor.
Add the wording of the assignement operators and emplace method.
Add the wording of the swap operation.
Add the wording of the observers.
Add the wording of the bad_expected_access class.
Add the wording of the swap free function.
Add the wording of the factories.
Add the wording of the hash.
Merge branch 'master' of https://github.com/TrademarkPewPew/std-expected-proposal