adding library underscore.js
refactoring: using underscore.js in module canvas
Improved logging when booting from disk
using underscore to iterate over disk
using underscore to iterate over disks
using underscore to iterate over commands
using underscore to iterate over files
using underscore to iterate over disks when openening disk
refactoring: moved openDisk to module io
using underscore to iterate over commands when executing command in shell