fixing default build configuration

[jrynkiew]

To allow new users to easily build your source, I wanted to add these changes. I think you moved the mmFBO files into the tools folder without changing the build CMakeLists.txt file, and the glfw build scripts don't work by default on my Linux machine, and I expect it will be the same on many others, so I just changed the "Use internal GLFW" GLAPP_USE_INTERNAL_GLFW option to TRUE so it is enabled by default. It will be easier for everyone