Fuzzy-asteroids

- Resolved error in AsteroidGame where game would end immediately due to while loop conditional
not being properly updated for new StoppingCondition enum
- Added Exceptions for incorrect user Score/Scenario inputs to run()/start_new_game()

- Added StopCondition enum to highlight the game completion reason
- Added "time_limit" setting to the environment settings dictionary
- Time limit stop condition included, added time tracking to the graphics window
- Score now tracks time and stopping condition
- Fixed error where the ship was given an extra life.
- Added computational cost tracking (evaluation time) to FuzzyAsteroidsGame via ``track_compute_cost`` kwarg, off by default

- First official release of the Fuzzy Asteroids Simulation Environment