WIP: [Socket] Async SSL Server

[cboden]

Refs #2

Seems to be functioning...example works with self signed cert using TLS crypto method.

TODO:

• Unit tests
• Let user select crypto method
• Try to get cert in memory so each connection doesn't block via filesystem I/O

[igorw]

How about making the connection implement PromisorInterface, so it can return a promise that resolves as soon as the conn is established?

[DaveRandom]

Looks like a fairly sensible impl, a few points though:

• It would be good to add an isSecure() method (or something) to Connection so you can do the check without the tight coupling of instanceof
• It would be good to be able to specify which of the STREAM_CRYPTO_METHOD_*_SERVER constants is used (this would be simple enough via the shiny new $context arg)
• (I'm sure you're already on top of this one in some way) there should be an error event emitted in the case of failure

[cursedcoder]

Do not forget to update http client too

[clue]

This PR seems like a good starting point, thanks @cboden!

This PR has been WIP for quite some time now and things have changed considerably since then :-)

React now consists of individual components that are maintained individually. Supporting server-side SSL/TLS is now related to the react/socket component.

As such, I've just filed a new ticket reactphp/socket#24 to keep track of this, so I suppose it makes sense to focus our SSL/TLS related efforts on this component.