Making sure all Commands use run in __call__.

[dhermes]

This way subclasses don't have to also set __call__ = run, they can just over-ride run.

ASIDE 1: @jonparrott Do you want me to write docstrings?
ASIDE 2: @jonparrott Is there a reason InstallCommand does not subclass Command?
ASIDE 3: I would label this as hygiene, but the label doesn't exist.

[theacodes]

ASIDE 1: @jonparrott Do you want me to write docstrings?

No need to write trivial docstrings (this is not a user-facing API)

ASIDE 2: @jonparrott Is there a reason InstallCommand does not subclass Command?

Probably just an oversight. Wanna see if inheriting breaks anything?

[dhermes]

Probably just an oversight. Wanna see if inheriting breaks anything?

Done and pushed.

[dhermes]

ISTM it will make Pylint angry that the constructor doesn't call super().

[theacodes]

ISTM it will make Pylint angry that the constructor doesn't call super().

I see - undo that for now, I think we just need to revisit and make the base class more abstract.

[dhermes]

@jonparrott Undid it. Unclear why the AppVeyor build is failing (it's the same error message I saw on Travis when updating InstallCommand(object) -> InstallCommand(Command)).