[test] Add some regression test for issue #426
[core] Compute correctly distance between wheels for WheeledRobot

Fix #426
[core] Improve style of wheeled_robot

- Use PEP008 naming convention
- Add whitespace between arguments
- Remove useless ;
- Wrap long line
[builder] mv properties() -> bpymorse

and add set_viewport(...) and delete(obj) in bpymorse module
[builder] mv set_viewport -> bpymorse
[builder] add helper to convert .blend to pure py

at least logic and empty objects (for now)
[builder] add setup replacing basics.blend (logic part)
[data] add basics without logic
[builder] setup cleanup
[builder] reload morse.core.blenderapi in setup

fix #405
[builder] remove MouseSensor.use_pulse

was not in 2.63
[builder] set render fps to 25 (default:24)
[builder] import at the top
[builder] setup scene
[test] add missing import math