Cappuccino Cappuccino

Cocoa conformance and bug fixes

• showRelativeToRect:ofView:preferredEdge: must take provide a view, and if the rect is empty it defaults to the view's bounds.
• If If showRelativeToRect is called while a popover is closing, it is ignored.
• If showRelativeToRect is called when the popover is already open, it should just reposition the existing popover.
• close should NOT consult the delegate's popoverShouldClose. Only performClose should do that.
• If a window is closed, all of its popovers immediately order out.
• Updated demo app to cover more cases.
• Note that child popovers are currently not supported, as this requires support for child windows in CPWindow. https://github.com/cappuccino/cappuccino/commit/93cc97002a1bfc13de0...