Bugfix: Binder examples Slithering Snake
Missing input argument 'rest_lengths' for initializing 'MuscleTorques' class is added.
" period=period,\n",
" wave_number=2.0 * np.pi / (wave_length),\n",
" phase_shift=0.0,\n",
+ " rest_lengths=shearable_rod.rest_lengths,\n",
" ramp_up_time=period,\n",
" direction=normal,\n",
" with_spline=True,\n",
