subplots in drawmatrix_channels about nitime HOT 2 OPEN

Do you think adding an optional ax=None kwarg to drawmatrix_channels() would work? If provided, for instance, from a ax = figure.add_subplot(nrows, ncols, idx), subplots could be achieved, and it opens the flexibility to people how they would like to arrange the subplots.

There is already a fig=None optional kwarg. Maybe we could make ax=None take priority if both ax and fig are given?

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Another option is to deprecate the fig kwarg (throwing an informative error or warning when that is provided) and to add an ax_or_fig kwarg that does the right thing depending on what kind of object it got. WDYT?

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