Changes:
 * remove useless texture.
 * change control keys.
 * refactor code.
Addedd following strutures and obj:

 * modelAsset struct which contain shader, texture, VBO and VAO.
 * modelInstance struct which contain transformation matrix and asset.
 * added assets and some instances.
 * added transparency cube instance to scene

Refactoring:
 * removed useless files.
 * moved ModelAsset and ModelInstance structs to own file.
 * renamed shaders.
 Changes:
	* add abstraction for asset.
	* added abstraction for instance.
	* change OpenGL settings.
	* ceate asset and instances for columns.
	* refactoring
 Changes:
	* added ball asset and 3 instances.
	* simple scene with net, volleyballs and spot light.
  	* fix up/down camera control
	* load models from files.
  	* use one ModelAsset with CUBE mesh
	* added multiple directonal and spot light.
	* added libaries to project structure.
  Changes:
	* added one direct light and 2 splotlights
	* added new spotlight(object) model to scene.
	* remove useless shaders files
	* renamed used shaders files
Added bench *.obj, *.mtl files and added benchs to the scene.
Change material colors in Model.h and scene.f.shader from vec3 to vec4.
Added default 4th parameter to ModelAsset::init for passing material diffuse color.
Added room object. Added 2 directional lights.
Added 2 direction lights and 4 spotlights.
Now window can be resized by user.
Refacroting.
Refactoring:
  * rename namespace tdogl to gk3d
Added README.md
Fix title
Update README
Changes:
   * added point light.
   * added court's texture.
   * change object's scale.
   * now is possible to add texture to one mesh.
   * extract CUBE mesh constants to Cube.h header file.
Now camera can be rotated clockwise.

Fix clockwise camera rotation.
Added one defective spotlight.
Update README.md
Fix build sectiion in README.md