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?
As I was looking through the CMake manual, I noticed that they [said](http://www.cmake.org/cmake/help/v3.0/command/file.html):

> We do not recommend using GLOB to collect a list of source files from your source tree. If no CMakeLists.txt file changes when a source is added or removed then the generated build system cannot know when to ask CMake to regenerate.

You don't have the problem here, since you're listing the files individually.  But if you're doing that, you might as well do `set(SRC_FILES`.