From 7311b75456b3f48320a9399731c34ec47d1ddad6 Mon Sep 17 00:00:00 2001
From: Francois Belair <razoric480@gmail.com>
Date: Thu, 6 Feb 2020 14:54:12 -0500
Subject: [PATCH] Add and have most demos use specialized agents

The agents auto-update themselves and can calculate their velocities.
This keeps the user from having to create an update_agent function.
It can also save the user from having to keep track of and update
velocities at all by using the provided `apply_steering` method.

Closes #15, closes #16