Add support for different initialization patterns

[jessicasyu]

Current patch initialization will initialize cells starting from the center of the environment outward. We should support random and inward initialization. Random initialization will be useful for #40.

Proposal:

1. Add a new patch level parameter called INITIALIZATION_STRATEGY
2. Update the createLocations method in PatchLocationFactory to handle the different strategies:
   • random = shuffle the locations list only
   • outward = shuffle the locations list, then sort by distance (the current implementation)
   • inward = shuffle the locations list, sort by distance, then reverse the list