Erase Request from stream2req when stream is closed.

Added --verify-client option to spdyd.

Move timeout checking into the query parameter condition.  Copy last_modified date string for file responses.

Add a timeout to spdycat

Add a timeout parameter to spdycat and add a crazy parameter to spdyd to test it (or test other clients)

The spdylay_data contains full of implementation details and is not
used in public API. It should be hidden.
The spdylay_frame union now only contains the control frame.

Spdylay library itself does not depend on OpenSSL. The example programs
in examples directory do. Spdylay library should be built without
OpenSSL.