== 0.0.2
- add `draw.sector` so it would be more straightforward to highlight sectors
- add ``track.margin``, ``cell.padding``, ``cell.xlim`` and ``cell.ylim`` in `get.cell.meta.data` function
- figures in vignettes are all generated automatically
- vignettes have been imporved

== 0.0.3
- vignettes has been improved
- ``xplot`` in `get.cell.meta.data` is now corresponding to the data direction in the cell
- number of points to draw links deduced.
- `get.cell.meta.data` can provide more meta data for a cell
- start degree and end degree now consistent with the data axis.
- the first sector is drawn first now.
- add `draw.sector`