Remove legacy options:

  'xValueFormatter'
  'pixelsPerXLabel'
  'xAxisLabelFormatter'
  'xTicker'
  'yValueFormatter'
  'pixelsPerYLabel'
  'yAxisLabelFormatter'
  'yTicker'
  'drawXGrid'
  'drawXAxis'
  'drawYGrid'
  'drawYAxis'
  'xAxisLabelWidth'
  'yAxisLabelWidth'

Fixes issue #514 
We should just delete this file, yeah?