SSS 0.1.2

  Stage 2 is building now and I'm fixed some system bugs. Recently I have to do something very important to me, therefore I have not much time on this project.

Changelog:
- Added stage2 background images.
- Added stage2 intro.
- Added high scores record function.
- Changed stage2 background music.
- Fixed scores function to be more efficient.
- Fixed some bugs when quit from stage2. 
- Fixed player charge will also increase boss hp bar.