glbinding in Readme and Travis scripts

README.md

 * [OpenGL](https://www.opengl.org) (3.3 Core Profile compatible)
 * [cmake](http://www.cmake.org) (>= 2.8.8)
 * [GLM](http://glm.g-truc.net) (>= 0.9.6)
+* [glbinding](https://github.com/hpicgs/glbinding)
 * [SDL2](http://www.libsdl.org) or [GLFW](http://www.glfw.org)
 * [OpenAL](http://www.openal.org) & [ALUT](https://github.com/vancegroup/freealut) (optional, needed for sound output)
 
 
     sudo port install cmake glm libsdl2
 
+Unfortunately, glbinding is not available as binary. But it can be built and installed from source easily. To create a distributable Bundle with glbinding in the default location, do this before running `make install`:
+
+    sudo install_name_tool -id /usr/local/lib/libglbinding.dylib /usr/local/lib/libglbinding.dylib
+
 ## Building
 
 The basic steps needed to build and run OpenRaider:

cmake/travis_install_linux.sh

 
 if [ "$CXX" = "clang++" ]; then sudo apt-get install --allow-unauthenticated clang-3.5; fi
 
+git clone https://github.com/hpicgs/glbinding.git
+cd glbinding
+cmake .
+make -j4
+sudo make install
+cd ..
+

cmake/travis_install_mac.sh

 #!/bin/bash
 
-brew install sdl2 sdl2_ttf freealut glm
+brew install sdl2 sdl2_ttf freealut glm glbinding