Merge pull request #26 from euroelessar/master

[qbs] Install symlinks to libvreen.so
Fix compilation with Qt-5.2.1

QApplication is part of Qt.widgets
Merge pull request #27 from VladRassokhin/fix-compilation-qt-widgets-dep

Fix compilation with Qt-5.2.1
Fix dependencies
Fix dependencies
qbs: Fixed compilation by qbs>=1.3