Fix method name.
hide SSL implementation headers behind interfaces

- turn SSLStream and SSLContext into interfaces

- move OpenSSL based implementation to vibe.stream.openssl
mark all SSLContext getters as const
Merge pull request #757 from MartinNowak/ssl_interfaces

Hide SSL implementation headers behind interfaces.
Merge branch 'master' of github.com:rejectedsoftware/vibe.d
Remove the "private" constructor hack for OpenSSL classes. See #757.
Make some small enhancements and corrections of the Redis API.
Add the first draft of a typed API for accessing Redis keys.
Merge branch 'master' into HEAD
Merge branch 'native-events' of https://github.com/etcimon/vibe.d
Merge branch 'master' into HEAD