How to use the attrs.FloatAttr function in attrs

New Attributes
	==============

	  - orientation: 1 = horizontal, 0=vertical
	  - scale_start: float: default 0.0
	  - scale_end: float: default 1.0

	FIXME:
		- set new attributes for marker & step length, value
		- update docstrings
	"""

	HORIZONTAL = fife.Slider.HORIZONTAL
	VERTICAL = fife.Slider.VERTICAL

	ATTRIBUTES = Widget.ATTRIBUTES + [IntAttr('orientation'), FloatAttr('scale_start'), FloatAttr('scale_end')]

	def __init__(self, scaleStart=0.0, scaleEnd=1.0, orientation=HORIZONTAL, **kwargs):
		self.real_widget = fife.Slider(scaleStart, scaleEnd)
		self.orientation = orientation
		self.setOrientation(self.orientation)
		super(Slider, self).__init__(**kwargs)

	def _setScale(self, start, end):
		"""setScale(self, double scaleStart, double scaleEnd)"""
		if type(start) != float:
			raise RuntimeError("Slider expects float for start scale")
		if type(end) != float:
			raise RuntimeError("Slider expects float for end scale")
		self.real_widget.setScale(start, end)

	def getScaleStart(self):