Fix a bunch of flake8 things

Fixes
- A bunch of unused imports
- A bunch of cases where variables were being assigned but not used
Haha yeah i know. I wonder if i could suffix the line with noqa, but put
whatever i want in the inline comment before that.
On Sep 11, 2014 7:09 PM, "Daniel McDonald" <notifications@github.com> wrote:

> In qiita_ware/context.py:
>
> > @@ -55,7 +55,7 @@ def __init__(self, profile):
> >
> >      def _stage_imports(self, cluster):
> >          with cluster[:].sync_imports(quiet=True):
> > -            from .context import system_call
> > +            from .context import system_call  # noqa
>
> someone is going to look at this code and wonder "wtf"... flake8 really
> should have figured out a more explicit tag
>
> —
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> <https://github.com/biocore/qiita/pull/272/files#r17459153>.
>