Cast error on Linux, corrected
Create LICENSE.md
Update README.md
Update README.md
Nothing special
Add balls with mouse in collision demo
New demo for alpha blending functions
Simplified the removal of objects from simulation by 
1. changing the destroy method in AbstractPhysicsObject
2. handling a list of objects to destroy in PhysicsWorld
3. properly destroy the objects at the right time during simulation
Modifications to take into account the simplified destruction procedure.
Something has changed but don't know what exactly
Added new headers and source information
New alpha blending demo
Corrected bug in removal of physics objects in collisions
Demos updated for the simplified removal
Updated comment
New Mistify-like screen-saver demo. 

Don't you have something better to do on the week-end ?
First try at writing a ShaderRenderer
Added proper heading
First try at mixing shaders and normal rendering
The original program on which shader rendering is based.