ENH: other plotting tools via plot accessor
- [ ] `scatter_matrix` (deprecate, redirect to `seaborn`)
- [ ] `andrews_curve`
- [ ] `parallel_coordinates`
- [ ] `lag_plot` (maybe rename to `lag`)
- [ ] `autocorrelation_plot` (maybe rename to `autocorrelation`?)
- [ ] `bootstrap_plot` (maybe rename to `bootstrap`?)
- [ ] `radviz`

I think it would be nice to allow [scatter_matrix](http://pandas.pydata.org/pandas-docs/version/0.15.0/visualization.html#scatter-matrix-plot) to be called directly on a DataFrame. Currently, `scatter_matrix` is a separate function that takes a DataFrame as a parameter, but it seems like it would be easy enough to rework to allow it to be called directly on a DataFrame as well. Effectively, the convenience function would look something like:

``` python
def scatter_matrix(self, ...):
    pandas.tools.plotting.scatter_matrix(self.data, ...)
```

Is this feature feasible?
