ENH: Viz topo cleanup

More tweaks and fixes to increase topo-beauty

@agramfort
@agramfort you don't want that when invoking ica.plot_components() without args .. 143 colorbars on 7 figures

> On Jul 13, 2014, at 8:37 PM, Alexandre Gramfort <notifications@github.com> wrote:
> 
> In mne/viz.py:
> 
> > @@ -2234,10 +2261,10 @@ def plot_ica_topomap(ica, source_idx, ch_type='mag', res=64, layout=None,
> >  
> >  
> >  def plot_ica_components(ica, picks=None, ch_type='mag', res=64,
> > -                        layout=None,
> > -                        vmax=None, cmap='RdBu_r', sensors='k,', colorbar=True,
> > -                        title=None, show=True, outlines='head', contours=6,
> > -                        image_interp='nearest'):
> > +                        layout=None, vmin=None, vmax=None, cmap='RdBu_r',
> > +                        sensors='k,', colorbar=False, title=None,
> I would have left colorbar=True by default wdyt? if not why setting it to true in the examples?
> 
> —
> Reply to this email directly or view it on GitHub.