deprecate several jquery-esque event aliases

[live627]

• Deprecate base.keyDown() (use base.bind('keydown', handler))
• Deprecate base.keyPress() (use base.bind('keypress', handler))
• Deprecate base.keyUp() (use base.bind('keyup', handler))
• Deprecate base.nodeChanged() (use base.bind('nodechanged', handler))
• Deprecate base.selectionChanged() (use base.bind('selectionchanged', handler))
• Deprecate base.valueChanged() (use base.bind('valuechanged', handler))