Add Zone Multiplicity

[courageousillumination]

Right now, if you want to create multiple zones you need to write them all out explicitly

zones:
   - name: "play_zone1"
     type: "play_zone"
   - name: "play_zone2"
     type: "play_zone"
   ...

You should be able to write it out with a special variable that will create multiple zones

zones:
    - name: "play_zone"
    - type: "play_zone"
    - multiplicity: 10

You could then access the first zone like this:

self.play_zone[0]

[courageousillumination]

Unittests have been added

[courageousillumination]

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