Write out fitness values now
Squashed commit of the following:

commit f736da18a82cbd3460ca1c02da135c2ed7b19a62
Author: rikardvinge <rik.vinge@gmail.com>
Date:   Mon Dec 15 23:57:33 2014 +0100

    Added plotting functionality

    Functionality to calculate moving average and standard deviation
Merge branch 'master' of github.com:tsmithe/adaptive-boids