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Macro NOT_COPYABLE(Class) implemented, which automatically creates empty assignment operators and an empty copy constructor for class.

Merge branch 'master' of ssh://dawes.informatik.rwth-aachen.de/data/git-repository/acgl/libraries/acgl

Until now only the class Texture used it. Now it has been added to ElementArrayBuffer, ArrayBuffer, FrameBuffer and ShaderProgram.
Static class members have to be initialized outside the header, so the file ElementArrayBuffer.cc had to be added.
Unbind calls e.g. glBindBuffer(GL_ARRAY_BUFFER, 0) outside of the specific class are not useful anymore, because it
would not reset the static context variable and thus lead to bugs/crashes.

* Added additional OpenGL error checks
* OpenGL error checks are better usable with namespaces
* Removed checks for OpenGL objects == 0 which would get ignored by OpenGL anyway and are rare
* Added comments
* improved OpenGL ES compatibility

Changed makefile to inlcude the headers and that acgl will automatically build all libraries by default.

shader attributes are now bound by their occurence in the shader source (just before linking the program)