Clean up TUIButton.
Add TUIButtonTypeStandard support.

Mimics the Calendar.app popover buttons. Simple.
Added TUIButtonTypeBeveled.

And a few additional drawing facilities for the rest of the button
types.
Added TUIButtonTypeEmbossed and TUIButtonTypeGradient.
Added TUIButtonTypeMinimal and TUIButtonTypeInline.
A few fixes and changes.
Added better examples of the buttons.
Fixed many odd bugs.
Merge remote-tracking branch 'upstream/master' into upstream-button-additions

Conflicts:
	TwUI.xcodeproj/project.pbxproj
Merge remote-tracking branch 'upstream/master' into upstream-button-additions

Conflicts:
	ExampleProject/Example.xcodeproj/project.pbxproj
	TwUI.xcodeproj/project.pbxproj
Button cleanup.
Fixed control state changes.
Cleaned up TUIControl.
TUIButton and TUIControl documentation.
Fix TUIControl's tracking methods.
Add basic touch event support for TUIView.
Add an internal NSTouch -> TUIView forwarding chain.
Allow TUIScrollView to highlight scroller if tracked.
Intelligently forward touch acceptance events up the view heirarchy.
Add a better example.