1.2.3: Removing deprecated calls to javax.applet APIs (AudioClip -> Clip)

Internal improvements. No user-facing change on this release.

v1.2.1

Release v1.2.1 with better Ponup API integration

v1.2 with some minor improvements

• Adding a tile background instead of plain colors. Updating some code to Java 1.7.
• Renaming spanish method names to English.
• Better pausing/resuming after an attempt of closing the game window.