Fork of https://github.com/plattysoft/Leonids

Applied changes:

• update of minSdkVersion, targetSdkVersion and other versions to match app's ones
• cleanup of library manifest to prevent collisions with app's one
• patch from plattysoft#63
• support for multiple particle drawables per system
• reordering of the drawing view to draw particles on 'background'
• skipping of drawing view invalidate calls during particles fast-forwarding