Separate sawdust particle systems for each log, sawdust lands under each log.
Using the flash logger to print debug messages.

Using 'INFO' logging level to prevent 'DEBUG' messages from being printed
Merge branch 'master' of github.com:serg-srri-umass/TP-data-games
Sawdust particles now have a random size variance.

The magnitude is set by the sizeVariance variable. If sizeVariance is 0, the particles will all be the same size.