Version 1.1: Released May 30, 2018

Added undo/redo support, which includes

• functionality to save the current state of the visualization and add to undo/redo stack given a user action
• functionality to load a previous/next state from the undo/redo stack
• keyboard shortcuts for undo/redo
• UI menu items for undo/redo
• dynamically enable/disable menu item depending on the state of the application

Fixed the following bugs:

• the selection state in a project is properly handled during saving and opening
• the visibility attribute of a collection was omitted and now included in saved projects and states
• clicking the "Align" button now triggers the align action only once
• menu item styling issues in Firefox