flake8 cleanup of ./electrum
flake8 cleanup of ./setup*
remove trailing whitespace from contrib
flake8 cleanup of contrib/make_download
Merge pull request #406 from WyseNynja/flake8_contrib

Flake8 contrib
Merge pull request #405 from WyseNynja/flake8_setup

flake8 cleanup of ./setup*
Merge pull request #404 from WyseNynja/flake8_electrum

flake8 cleanup of ./electrum