Move UI's init events calls to init
Encapsulate UI's inputs to inputs hash
Define #advanced-settings
Define #advanced checkbox
Define #total-width input and .setting.disabled
Assign $totalWidth and $advanced in main.js
Parameterize UI's initInputs() with jslider
Re-init inputs on UI's update()
Describe #equals
Implement #equals
Add space after "if" in ui.js
Run UI's preview() only if jslider has changed
Declare $totalWidth and $advanced in ui.js
Define initAdvancedChangeEvent() in ui.js
Define getOptions() and canUpdate() in ui.js
Use getOptions() and canUpdate() in ui.js

* simplify the update() method because canUpdate() did the job
* parameterize the preview() method with jslider