ContinuousAxis 
    Represents an axis over a continuous scale. Generally, this is applied to a drawing by calling Selection.call on a selection of a single GroupElement or TransformElement. Mutating style properties like tickCount should not happen concurrently with calls to applySelection or Selection.call.
TODO: Axis should support scales other than ContinuousScale, but since we don't have other scales yet...
Properties
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                  Formatter for converting from the domain values to tick labels. This defaults to Any.toString.
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                  Padding between tick lines and tick labels.
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                  Length of the tick lines drawn from the axis, for each tick.
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                  Length of the tick lines drawn from the axis, for the squared ends of the domain path.