re-organise file structure

Create _media and _js folders to sort files more logically
update for moved spritesheet location
formating
remove debug statements
add unit.teleport() for sending workers home
x keybinding teleport workers or explode soldiers
Moving all audio to soudn class
sound now working
cleaned and commented board.js

Commented board.js
added some TODO: comments
cleanup and add comments to code.js

Cleaned up some commented out code and added some new comments and
TODO: comments
clean code, add comments canvas.js

Remove unused code and add some comments
commented and simplified config.js

added comments
removed unused code
added a couple of TODO:s
cleanup and comment effects.js
Update credits.txt
remove preloader.js
cleanup and comment  sound.js
updated sprite resources
Enable teleport effect
add speaker icons
move buttons to new ButtonClass