Release 0.4.0

New features:

• staged figures
• faster constraint solving by eliminating variables
• animated trees
• MathJax content
• saving and restoring styles
• graphical objects now have a "target" point
• objects can be placed over or under other objects
• polygons can have rounded corners
• curved arrowheads
• negative space text
• zoomed figures
• font embedding support for PDF rendering

Bug fixes:

• FIxed handling of vector operations
• connectors to rounded rectangles now connect securely
• better line label placement (this is not backward compatible, unfortunately)