Minimum required Qt lowered to 5.5.0
Added CI for Qt 5.5.1 build
Increased C++ standard to C++14
Fixed use of spaces instead of tabs
Removed duplicate constructors
Fixed naming of projects using CMake
Added working static compile using qmake
Added conventional naming of debug libraries
Added install target to qmake
CMake has been announced as the build system of choice for Qt in the
future so it's useful to provide a project file for it
Also added the possibility to compile as a static library
