Added error event handlers for checkbox
Added error and success event handlers for dragging form sections

When saving new order was successful, the dragged field blinks green. When unsuccessful, the field gets red.
Bugfix success handler

All toggled lines were blinking, that is now fixed.
Added error notice for forms

If changes to form_section could not be saved user is asked to reload.
Please note: Added not_saved message in all locales (not sure if that is right).
Closes #https://github.com/rapidftr/tracker/issues/139
Merge pull request #714 from RapidRailsGirls/issue_139

Adds feedback for toggle/reorder fields and form sections in form builder - References rapidftr/tracker#139