Gustavo & Cassiano: correções para bugs #25 e #26

[cdbandrade]

Correções sugeridas para bugs #25 e #26

[fegemo]

Corrige #25 e #26. Para #26 (JumpTheObstacles), fiz os seguintes commits a mais:

• https://github.com/fegemo/cefet-games-meow-au/commit/826e7c1e8c13cbf561bf1dbe1f45ae1e2cb30d57
• https://github.com/fegemo/cefet-games-meow-au/commit/6c43ff6627c5351f0b8a1e98fc4884f03c942965
• https://github.com/fegemo/cefet-games-meow-au/commit/68c58f808a1b0572129caae7a1c804b41e90d3a2