message: kwargs to drawTrajectory
diff: @@ -177,7 +177,7 @@ class BaseViewer(Viewer):
  def drawPolygon2d(self, polygon, color, alpha, facecolor=None, zorder=10):
  pass
  - def drawTrajectory(self, trajectory, color):
  + def drawTrajectory(self, trajectory, color, **kwargs):
  pass
  def drawObstacle(self, obstacle):
  