Make release flag persistent.
Adds viewport culling in the GL backend.
Adds a lightweight frame rate monitor.
Adds ability to drag the culling viewport around by holding down the "V" (viewport) key and dragging it around. An option is also provided to change the diameter of the viewport.
Adds ability to toggle profiler by pressing the "R" (record) key.
Moves the location of profiler examples.
Make original_valueOf and original_toString non enumerable.