* remove unused mBufferMappings
    * warn when mapping multiple locations to same attachment
    * cap size for bufferMappings at GL_MAX_DRAW_BUFFERS
    * bind FBO before validate()

The shared and weak pointers are now included via ACGL.hh, this way there is one
one central place to replace the pointers if needed (C++11, TR1, boost, own variant).
For this, they are placed in a ptr namespace so std:: (C++11) and str::tr1:: (C++98)
variants as well as boost and own implementations can all get redirected.
C++11 detection added and correct non-tr1 header include added (should make VS2010
porting easier).

* move mMode fom ArrayBuffer to VAO
* add attachAllAttributes method to VAO
* allow adding VAO attributes without binding them (location == -1)
* store state of previous VAO binding in static field

* Added constness to the buffers which are hold by the vertex buffer object (otherwise you cannot attach const buffers and there is no reason why this should not be possible)
* IMPORTANT: Fixed a major bug in the ACGL RenderObject which caused a wrong mapping to the array buffers! All projects should update to this newest version of ACGL!

* Furthermore introduced a factory to register new file types (currently jpg and png).
* Added support for cube mapping

This commit closes #106, #107

Changed primitive int types in the texture to the correct OpenGL types and fixed the initialization list of the jpg controller

* setWrap() will now only be called if a wrap value was explicitly set before
* added rare error check

* Extended RenderBufferControl accordingly

* First version of VertexArrayObjects
* added VAO related functions to the DSA extension

OpenGL object names were misleadingly named context which can be mixed up with
the OpenGL context. Object name is the correct term used in the specs.

* Reduced warnings (by adding casts, removing unused variables etc)
* Deactivated warnings inside of GLM (gcc only)
* Fixed setUniform bug where the transposed parameter for matrixes was ignored

* Some GL 2.1 compatibility improvements:
  * On GL 2.1 the shaderfiles are read from a different folder by default
  * 3.0+ functions are not compiled for 2.1 any more
  * The RenderObject is not 2.1 compatible, so it's not compiled for old systems
    atm. A port could be possible.
  * ACGL compiles for GL 2.1 now
* Added compile warning in case the desired OpenGL version is not defined by
  the build system (which could screw up conditional compile)
* Minor fixes

* GLEW is not core profile campatible, new ACGL::init() code tries to work around that
  NOTE: on core profile systems (like OSX 10.7 Lion) no extension will be detected by GLEW
* Added some optional error checks that helped finding compatibility errors

* improved compatibility with pure core profiles
* minor typos