Refactored factory module to use data_service
Fixed bug with deleting newly created note
Refactor to data_service to save groups in progress
Deleted old code to save nested groups and notes
Saving groups with data_service in canvas controller
Refactored nestChildren directive to use data_service for saving data
Fixed bug in nestChildren directive by setting position to data.x,y or style.left,top instead of toggling
Fixed bug in nestChildren directive by setting position to data.x,y or style.left,top instead of toggling
Added check for existence of childScope