Added day 9 font files
Added isAlive attribute to Bird (day 9 merge)
Added font loading code (day 9 merge)
Fixed disposal of sound resources
Changed score counter to use fonts (day 9 merge)
Added ground (day 9 merge)
Using bird attribute isAlive instead (day 9 merge)
Added max time delta (day 9 merge)
Doesn't need to check if we are alive to give score points
Use of bird attribute isAlive fix (day 9 merge)
Removed old bitmap numbers
Fixed missing creation of ground (day 9 merge)
Restricted bird to not go over screen (day 10 merge)