- fixed a bug, where the avarage pixel value was not correctly
  calucated when a grid was used.
- i still might need to change how the rating handles obscured
  parts of the pattern
Merge branch 'master' of https://github.com/kumakhao/loca-bbm
- changed the angle of the camera to 30° up
- made some changes to the experiments in main()
- changed how the perspective is set in the simulation
- pics are not taken every t seconds. Instead it is based
  on step_count
- made crowd positions random, and moved them into a function.