Generate obstacle script

[darkobozhinoski]

To define a cluttered environment, we need to be able to inject a set of obstacles that are not part of the initial map.
In the current experimental setup, we are able to inject only 3 obstacles (defined in a specific position near the goal).
Here, we create a script to generate random obstacles on the map.
The script has the following inputs:

• number of obstacles;
  This number of obstacles defines the cluterness of the environment.
  Choose variations for {low, medium, high}. E.g. (low=3, medium = 8; high=20}

More info on this: https://docs.google.com/document/d/1pGxXg7ierV7L0mMmBsZvgysEYl14Xm1b_GXzoPDJK7g/edit#bookmark=id.86r68belyj2o

[marioney]

The obstacle script is been updated in cbd911d , it adds 6, 14 and 20 obstacles trough the map.