Fix blender exporter

Add default material if nothing is assigned to object.
Re-calculate normals after transformation matrix applied.
Update Light class

Rename innerAngle to angle, outerAngle to blend.
Note: blend parameter semantics is now as in blender's spot light
blend parameter.
Update example application

Increase player speed multiplier to 8.0f.
Set test light energy value to 0.5f.
Finalize Phong reflection model

Add ambient intensity to geometry buffer, use it in light equasions.
Implement diffuse and specular highlights.