Extend interfaces from psr/http-factory (#43)

Now that PSR-17 is accepted, we can mark this package deprecated, and do
a new minor release that has all interfaces extend those from the
official specification.

Release version 0.4.0

Merge pull request #30 from http-interop/fix/sync-with-psr-17

Sync with FIG proposal

Merge pull request #23 from http-interop/fix/server-factory-server-pa…

…rams

Add support for passing server params to factory