[BUG #7710] render sliders on init
[BUG #7710] added "indexOf" for collections
[BUG #7710] refactored widget initialization
minor
[BUG #7710] recalculate pixel steps when necessary
[BUG #7710] Disable/enable all demo widgets at once
[BUG #7710] select tab by URL hash
[BUG #7710] configured demos