message: More astroblasto cleanup
diff: //! The idea is that this game is simple but still
  //! non-trivial enough to be interesting.
  -extern crate ggez;
  -extern crate nalgebra;
  -extern crate rand;
  -
  +use rand;
  +use ggez;
  use ggez::audio;
  use ggez::audio::SoundSource;
  use ggez::conf;
  @@ -18,13 +16,13 @@ use ggez::{Context, ContextBuilder, GameResult};
  use std::env;
  use std::path;
  -type Point2 = nalgebra::Point2<f32>;
  -type Vector2 = nalgebra::Vector2<f32>;
  +type Point2 = na::Point2<f32>;
  +type Vector2 = na::Vector2<f32>;
  /// *********************************************************************
  /// Basic stuff, make some helpers for vector functions.
  /// ggez includes the nalgebra math library to provide lots of
  -/// math stuff We just add some helpers.
  +/// math stuff. We just add some helpers.
  /// **********************************************************************
  /// Create a unit vector representing the
  