This option sets maximum receive buffer size for incoming control
frame.  Basically the library checks the length field of the incoming
control frame. For frames with name/value header block, the library
also checks the length of inflated block is also under the limit. This
is done while incrementally inflating block. If the length of frames
with name/value header block exceeds the limit, the library will issue
RST_STREAM with FRAME_TOO_LARGE. For other frames, it will issue
GOAWAY.

Current SPDY/3 spec does not clearly prohibit to send
delta_window_size which makes resulting window size more than initial
window size. For this reason, spdylay_submit_window_update() can send
delta_window_size in [1, (1 << 31)-1], inclusive, without bounded by
stream's recv_window_size. Of course, the application is now
responsible to keep the resulting window size <= (1 << 31)-1.

spdylay_submit_window_update() now returns
SPDYLAY_ERR_INVALID_ARGUMENT if delta_window_size is 0 or negative.

Print, for each stream, time delta from SSL/TLS handshake and each
SYN_STREAM. The time deltas are measured after SYN_REPLY received and
all data received.
For example, the following output:

  SYN_REPLY: X(Y)

means SYN_REPLY was received X ms after SSL/TLS handshake and Y ms
after the corresponding SYN_STREAM was sent.

If this option is used, spdycat also downloads assets such as
stylesheets, images and script files linked from the downloaded
resource. They are queued in the same SPDY session.

This is because compiler may warn that name `index` shadows global
declaration if the application code uses the prototype argument names
as is.

Updated program output to the latest version. Mentioned spdycli.