Merge pull request #8 from MichaelEischer/master

Fix QDataStream compatibility with Qt5

Install qt5 in travis ci

Fix build on windows

Explicitly bind multicast sockets to IPv4 in Qt5

Fix compilation of example reader

Fix compiler warning

Support building with Qt5

Fix protobuf version warning

Rework qt library linking

Merge pull request #9 from RoboCup-SSL/travis

Build with qt4 and qt5

Add travis build config

Merge pull request #5 from RoboCup-SSL/bugfix-slidebar

Fix undefined behavior for slider (missing return) + half speed (see #1)