Issue #116 Preparing the model to create all details and doing simetric body

I split the model in 2 pieces, taking 1 piece of them and using the
mirror effect, we have a simetric model. Also I removed useless vertexs
and edges ( not all ).
Issue #116 Cleaning the model of rooster leader of useless vertexs and edges.
Issue #116 Fix the angle of legs. The chicken have the inverse angle of knees.