Update of .gitignore
Removed not needed Scene class
Added doc target to generate documentation with Doxygen
Excluding external directory from doxygen generation
Merge branch 'master' of https://github.com/sabus/OpenGLES_Engine
glcore::Attribute::BindLocation now takes ProgramPtr as argument
Changed glutils::Mesh member ibo,vbo to SharedPtr
Refactoring

Replaced boost::shared_ptr<Mesh/Entity> to MeshPtr,EntityPtr
Added typedefs for EntityManagerPtr and SceneManagerPtr.
Removed memory leak in glutils::World
Create Function removed from entity. Job class introduced
Merge conflicts fixed