WIP: add svg backend to report.py

cc @mainakjas @agramfort 
oops. i was trying to debug mne_report.py -- it crashes badly on my machine when running the tutorial examples



> On 13 Oct 2014, at 08:54, Alexandre Gramfort <notifications@github.com> wrote:
> 
> In mne/commands/mne_report.py:
> 
> > @@ -1,4 +1,4 @@
> > -#!/usr/bin/env python
> > +#!/usr/bin/env ipython --pylab qt
> is this a good idea for everybody?
> 
> can I still generate reports without an X server?
> 
> —
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