agent.cpp and agent.h:
changed predator and prey types to 1 and 0, this works for the matlab
make_movie_2dq function, you may need to alter your own
also may need to be changed in the unused constructors

helper_fcns.cpp:
added prey with fear update function

predator.cpp:
changed predator type
made predator suck less (*still needs work tho)

world.cpp:
changed the way things print out to accommodate integer predator/prey
types