Moved out the look where you are going for the main wander algorithm from inside the algorithm to outside of it. So if you use the wander algorithm you aren't forced to also look where you are going (useful for priority steering).
Added an example of priority steering. Sadly its more complicated than it needs to be, because I did not follow the book's model of making each steering behavior its own class (all my steering behaviors are just stand alone functions right now :(  )
I improved the comments for the priority steering