Add libraries for sound loading and management.
Added some experimental code for including audio directly in an HTML file.
Replaced slider image that came from the Flash IDE with an internally created version.
Updated.
Added audio files into package.json and into the imageLoader file.
Work towards integration of audio into the single-file branch.
Removed sounds from the HTML document - they are now inserted by the build process (or will be soon).
Minor syntax fix - removed unneeded comma.
Merge branch 'single-file'
Removed files that were added as experiments in audio support, but are no longer needed.