Bug fixes and more in 3.2.4

I just released the new bugfix version (3.2.4) which fixes the following bugs (all of them reported by Keith):

• Repel touches were off in big simulation area mode.
• Zooming multitouch acted as a single touch when first finger was lifted.
• Particles got stuck on wall ends.
• Additionally, the maximum number of walls has been increased from ten to fifteen.

As usual, you can download it from the Google Play Store.