Complete

 I've completed the Flappybird assignment.

The gap between the pairs is now random with this change

to the pipepair definition:

The spawn of new pipepairs is now random thanks to the

following change in the PlayState mode (line 39):

And the medal and Pause features were done previously. 

Now if I could just play this game with enough skill to illustrate

the changes...

Best I can do: the medal shows up as 0 and disappears when I eventually

score 1!! Thus, the code should read when score > 5, or whatever for the level.

Still, one can see the pause function, and that the gap varies, as does the schedule

of new pipe pairs.