ENH: (WIP) MVAR connectivity and example

example does not run for me

```
In [2]: plot_connectivity_inoutcircles(con_res['PDC'][:, :, 0], 'temporalpole-rh',
   ...:                                label_names, node_angles=node_angles,
   ...:                                node_colors=label_colors, title=title)
---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<ipython-input-2-ac98dae0418e> in <module>()
      1 plot_connectivity_inoutcircles(con_res['PDC'][:, :, 0], 'temporalpole-rh',
      2                                label_names, node_angles=node_angles,
----> 3                                node_colors=label_colors, title=title)

/Users/alex/local/lib/python/site-packages/mne/viz.py in plot_connectivity_inoutcircles(con, seed, node_names, textcolor, colormap, title, fontsize_suptitle, fig, subplot, **kwargs)
   3014     if seed < 0 or seed >= n_nodes:
   3015         raise ValueError('seed={} is not in range [0, {}].'
-> 3016                          .format(seed, n_nodes - 1))
   3017
   3018     if type(colormap) not in (tuple, list):

ValueError: seed=temporalpole-rh is not in range [0, 67].
```

hard to find a name without seeing what it does