added SoundHandler.as, removed embedded sounds from ChainSaw. Implemented basic looped and faded sounds for onMouseDown and onMouseUp. added numLoops to the play() call in fadeIn in AdvancedSound
Merge remote-tracking branch 'mike/master' bringing in Mission Class modularization from Mike
Merge remote-tracking branch 'mike/master' merging in Mike's newest changes
fixes issue #102, clouds are now cleaned up properly at the end of each mission
Merge remote-tracking branch 'serg/master' merging in changes to serg, expecting already up to date.
final fix for issue #102. removed trace statements, and other general cleanup