Added temporary support for multiple lights, added another debug material.
ResourceManager now uses shared pointer for meshes.
Changes material handling to  shared_ptr.
Finished the switch to shared poiters for resource management.

Also added a small screenshot to the readme.
Added .md ending to readme.
Added glDelete calls, made some modification to Mesh class.

To guarantee that glDelete calls are made while the GL context is still
active, all relevant lists are explicitly cleared.
remove volumetricSceneObject from Makefile, source was deleted
fbx import
let ResourceManager::load* mesh functions create objects
use new fbx importer
Merge pull request #1 from stbuehler/fbx-dev

use simplistic open source fbx importer
Fixed Visual Studio 2013 compiler errors.

Project compiles under Windows but doesn't run as intended.
fbx cleanup
replace pragmas with project config
fbx fix casts
fix file_type extraction
use #include <...> to include external headers
Merge pull request #2 from stbuehler/fbx-dev

fix windows build
fbx: more type/casts fixes for 64-bit windows
embed miniz.c from https://miniz.googlecode.com/