Feature Update

[diwi]

• simplyfied rotation math that works better across all zoom-scales.
• updated scale for zoom/pan/rotation
• zoom bugfix, when limits are about to exceed (damping-animation gets stopped). Right now, the damping continues, which makes the zoom get stuck.
• viewport attribute: new feature that allows for proper offscreen rendering and multiple cameras/screens. See the included MultiView examples for further details.
• plus a couple of new Library examples.

// new public methods

public void setViewport(int x, int y, int w, int h);
public int[] getViewport();
public PGraphics getCanvas();

[jdf]

Also, anywhere my name appears in the header comments, please add yours as a co-author.