Reverting "No more of this find_packages nonsense."

This reverts commit b75eb88fabdac4a9fdc863969ec9472110732607.
Add a bit more docs to plugin configuration

This commit sponsored by Michael Rauch.  Thank you!
typo
Merge remote-tracking branch 'upstream/master' into auth

Conflicts:
	mediagoblin/app.py
	mediagoblin/auth/forms.py
	mediagoblin/auth/tools.py
	mediagoblin/db/migrations.py
	mediagoblin/db/models.py
	mediagoblin/edit/views.py
	mediagoblin/plugins/basic_auth/tools.py
	mediagoblin/tests/test_edit.py
cleanup after merge