Relieve some mandatory dependencies about seaborn HOT 7 CLOSED

It would indeed be nice if e.g. moss could be made optional for now.

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That would be difficult, as any function that draws error bars (e.g. most of them) uses it to compute confidence intervals. The better medium term solution is just to make moss (or those parts of moss) part of seaborn.

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since six is a now a dependency for matplotlib, does it need to be on this list?

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ggplot recently switched over to require six.

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Probably should either bundle or require it for 0.3 at least, since a lot of people won't have updated matplotlib between now and then.

I actually have a branch where I've started the process of bundling six/husl/moving computation from moss into seaborn. It seems manageable, although it does mess up coverage statistics (I'm sure there's a way to deal with that).

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few leftovers:

$> git grep moss
README.md:- [moss](http://github.com/mwaskom/moss)
examples/example_plot.py:import moss
examples/example_plot.py:    boots = moss.bootstrap(x, y, func=lmpred, n_boot=100)
examples/example_plot.py:    ci = moss.percentiles(boots, [2.5, 97.5], 0)
requirements.txt:moss>0.1

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Thanks, nice catch.

The example_script.py will get cleaned up when I address #51

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