0.0.8

Changes

• Add samples per pixel scene parameter -spp <N> to increase the number of samples taken per pixel in a single traceray launch. This can help get a better ray throughput measurement by reducing the impact of possible driver overheads from the measurement.
• Add a material mode parameter (-mat-mode (default|white_diffuse)) to choose between the default textured/shaded scene config (using the data from the scene file) and a white_diffuse option that replaces all materials with a single rough white diffuse material for benchmarking ray tracing.