Merge branch 'develop_dimitri'
- Updated LuGus Audio files.
- Fixed sounds not turning back on.
- Updated level thumbnails.
- Added new app icon.
- Added object hit condition.
- Added object not hit condition functionality.
- Fixed pentagram not resetting.
- Added button pressed condition.
- Added ball count condition.
- Added new/completed challenges button animation.
- Added challenge animations.
- Fixed issue with closing challenges menu.
- Added flipper condition.
- Added stars animation for completed challenges.
- Added input key condition.
- Replaced Google plus icon with LuGus Facebook icon.
Merge branch 'master' into develop_dimitri