Increase the size of the QHostInfo cache.

This change increases the size of the DNS cache in QHostInfo from 64
entries to 128. Given the figures in the google chrome performance paper
http://www.igvita.com/posa/high-performance-networking-in-google-chrome/
this should mean we can cache enough entries to handle 4 tabs at once.

Change-Id: I34e32e9e0966473591c59ca5f222623a354650d2
Reviewed-by: Peter Hartmann <phartmann@rim.com>
Add the pristine SHA3 reference sources.

Add the SHA3 reference implementation (public domain) which will be used
in a later commit to add support for SHA3 to QCryptographicHash.

Change-Id: Id0e9d47d628cc94f1d3d2a7696836bc43f6ddf61
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
SSL: Implement session sharing and use it from QNetworkAccessManager

This improves performance since a network round trip can be avoided.

Change-Id: I1aaff7e48ef9638cb137de0f43942c3a4dd2884a
Initial-patch-by: Markus Goetz <markus@woboq.com>
Reviewed-by: Richard J. Moore <rich@kde.org>