Updating to GLFW3 (3.0.3) and downloading it via CMake.

Hi there, I have tested this on OSX 10.8.5 and it works... don't know why I need to push two times "Run" on XCode.

Disclailer: I don't know much cmake.

I have made 2 things

1. Delete all the source code from GLFW and download it via cmake.
2. Update to GLFW 3.0.3 the 3 samples.

Also if you see the CMakeList.txt for the Samples, you will see that they are only configured for add the library from src/Debug from the install_dir.... so I guess this is to much osx and Debug mode... I don't have other machine for continue working on Linux or Windows case. Also I don't know much about http://www.kitware.com/media/html/BuildingExternalProjectsWithCMake2.8.html I just read it and make search like:

https://github.com/search?q=ExternalProject_Add++zip+path%3ACMakeList&type=Code
https://github.com/search?q=GIT_REVISION+path%3ACMakeList&type=Code

And do some try & error.