Fixed https://github.com/amix/vimrc/issues/546

This is done by removing custom FileType indent options, and using
`vim-python-pep8-indent` plugin.

sources_non_forked/vim-python-pep8-indent/Makefile

@@ -0,0 +1,25 @@
+test:
+	VIMRUNNER_REUSE_SERVER=1 xvfb-run bundle exec rspec
+
+# Run tests in dockerized Vims.
+DOCKER_REPO:=blueyed/vim-python-pep8-indent-vims-for-test
+DOCKER_TAG:=3
+DOCKER_IMAGE:=$(DOCKER_REPO):$(DOCKER_TAG)
+
+docker_image:
+	docker build -t $(DOCKER_REPO):$(DOCKER_TAG) .
+docker_push:
+	docker push $(DOCKER_REPO):$(DOCKER_TAG)
+docker_update_latest:
+	docker tag $(DOCKER_REPO):$(DOCKER_TAG) $(DOCKER_REPO):latest
+	docker push $(DOCKER_REPO):latest
+
+test_docker: XVFB_ERRORFILE:=/dev/null
+test_docker:
+	@set -x; export DISPLAY=$(if $(VIMRUNNER_TEST_DISPLAY),$(VIMRUNNER_TEST_DISPLAY),172.17.0.1:99; Xvfb -ac -listen tcp :99 >$(XVFB_ERRORFILE) 2>&1 & XVFB_PID=$$!); \
+	  docker run --rm -ti -e DISPLAY -e VIMRUNNER_REUSE_SERVER=1 \
+	  -v $(CURDIR):/vim-python-pep8-indent $(DOCKER_IMAGE) $(RSPEC_ARGS) \
+	  $(if $(VIMRUNNER_TEST_DISPLAY),,; ret=$$?; kill $$XVFB_PID; exit $$ret)
+
+test_coverage:
+	spec/make-coverage