Fixed robot's materials parsing (when using urdf geometry) and setting up (enabling transparency).
Changed SimulatedDevice signature a bit to enable overriding in ViewBuilder.
Enable physics debugging using --debugPhysics flag.
Merge pull request #15 from tut-yury/hydro-devel

Fixed URDF materials parsing and application (of transparent materials). Added possibility to set up ViewBuilder inside plugin and to visually debug physics.