Add flake8 config, flake8 and watch_flake8 make command

Author: tony

Makefile

@@ -9,3 +9,11 @@ build_docs:
 
 watch_docs:
 	cd doc && $(MAKE) watch_docs
+
+flake8:
+	        flake8 tmuxp
+
+watch_flake8:
+	        if command -v entr > /dev/null; then find . -type f -not -path '*/\.*' | grep -i '.*[.][py]' | entr -c make flake8; else make flake8; echo "\nInstall entr(1) to automatically run tests on file change.\n See http://entrproject.org/"; fi
+
+.PHONY: flake8

setup.cfg

@@ -0,0 +1,3 @@
+[flake8]
+exclude = .tox,*.egg,tmuxp/_compat.py,tmuxp/__*__.py,
+select = E,W,F,N