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?
Let's add new lines to the end of the file, not the beginning.  (No good reason, just how I like to do things.)

Also, do you have any idea what this .excludes file is?  It keeps showing up on my system too.