Reorg modules

```
Plottable
  - Abstract
    * Axis
    * BarPlot
    * Broadcaster
    * Component
    * ComponentContainer
    * Interaction
    * Plot
    * PlottableObject
    * QuantitiveScale
    * Scale
    * XYPlot

  - Axis
    * Category
    * XAxis (to be deprecated)
    * YAxis (to be deprecated)
    * Axis  (to be deprecated)

  - Component
    * AxisLabel
    * Gridlines
    * Group
    * Legend
    * Table
    * TitleLabel
    * ToggleLegend

  * DataSource

  - Interaction
    * Click
    * Drag
    * DragBox
    * Key
    * Mousemove
    * PanZoom
    * XDragBox
    * XYDragBox

  - Plot
    * Area
    * VerticalBar 
    * Grid
    * HorizontalBar
    * Line
    * Scatter

  - Scale
    * Color
    * InterpolatedColor
    * Linear
    * Log
    * Ordinal
    * Time

  - Singleton
    * KeyEventListener
    * RenderController

  - Template
    * StandardChart

  - Util
    - Axis
    - DOM
    * IDCounter
    - Methods
    - OpenSource
    * ScaleDomainCoordinator
    * StrictEqualityAssociativeArray
    - Text
    - WordWrap
```