initial work on qt5
initial work on qt 5.1.1

Merge commit '37d8e765befcac64d41c2ed4fba94a81097b303b' into feature/qt5.1.1

Conflicts:
	dependencies/windows/README
	package/linux/make-package
	src/.gitignore
	src/cpp/core/system/Win32System.cpp
	src/cpp/desktop/DesktopMainWindow.cpp
	src/cpp/server/ServerOptions.cpp