introduced command.js
Fixed 404 on case-sensitive file systems.
Copy files in the img folder to the build path.
Added different scaling modes for background image.
command.js
Merge remote-tracking branch 'origin/master' into cmd
Merge remote-tracking branch 'visualIDE_yj/master' into cmd
Merge branch 'master' into cmd

Conflicts:
	js/command.js
Merge remote-tracking branch 'origin/cmd'
Hooked up the commands population to the new commands data.

Beautify the commands descriptions.
Changed the ordering of the assignment so the object will not be undefined.