Review changes made for Issue #53 CMake

I've made all the CMakeList files the project needs. I managed to get the project to build, compile and install. However, when I try to run the qmlscene ui/main.qml, it can't seem to find the directories where the plugins are installed. Could you have a look?
The examples I used all included all the files needed for building, but I could try experimenting on what exactly is really needed. I was fuzzy on how CMake logic works when looking at header files. I'll play around with this one.