adjustment to doOnPercentPlayed for revDown sound. Needed it to transition into idleSound later
removed silent space at beginning of popSound, normalized mp3 file, set volume to .5 in ShipOdyssey.mxml
fix for issue #122, problem with end game overlay
fix for issue #125, old_sounds were being moved to bin-release. now in obsolete folder at root level
ChainSaw: remove extra copy of unused sound: ChainSaw/obsolete/startIdle.mp3 exists, so delete ChainSaw/src/embedded_assets/startIdle.mp3.

ShipOdyssey and Chainsaw: add {projectbase}/.settings/com.adobe.flexbuilder.project.prefs with setting to use 4.5.1 version of Flex 4 SDK, so that Craig's new copy of Flash Builder (4.7) uses same build as other development machines, which currently use 4.5.1.  I hope that this new preference file does not cause any problems when added to a project for Flash Builder 4.5.1.