Nyan Cat Version 2.0

Add scrolling background. The scrolling still not working properly
because it has gap every time it iterates.
Nyan Cat Game Version 2.1

Background scrolling fixed.
Nyan Cat Game Version 3.0

adding nyan cat baloon and tac nyan that scrolles same direction with
the background.
Nyan Cat Game Version 3.0 (same version)

From the coding perspective there is no changes at all. Only comment
added, "adding the music background that loops through the game"
Nyan Cat Game Version 4.0

The collision effect has been added, everytime nyan cat hit nyan baloon
and tac nyan those two sprites will resest and play the sound effect as
well.