Latest Core, Network and Tria. See full description for details.

Core:
 + Session and SessionManager to manage user sessions, e.g. with Http*
 + TemporaryBufferDevice, a QIODevice for buffering data into memory
   or on disk, depending on how large it gets
 + ReferenceDevice, QIODevice which references a byte range of another
   device

Network:
 * Fixed compilation on windows in RestfulHttpNode
 * Removed dead code

Tria:
 + Now also exposes default (copy) constructors.
Fix Tria integration for win32.

Allowed specifying tria's path.
Added libc/libc++ include dirs to tria call when running under win32.
configure: nuriavars.prf should look in $BINDIR for 'tria'
Merge remote-tracking branch 'origin/tria-win32'