tests: Big push to get the tests to pass again. - Lots of fixes everywhere in the code. - Try to handle debug logging in the multiprocessing worker pool when running in pytest. Not perfect, but usable for now. - Replace all `.md` test files with `.html` since now a auto-format extension always sets the format. - Replace `out` with `outfiles` in most places since now blog archives are added to the bake output and I don't want to add expected outputs for blog archives everywhere.

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/bakes/test_dotfiles.yaml	Sun Oct 29 22:51:57 2017 -0700
@@ -0,0 +1,8 @@
+---
+in:
+    assets/something.txt: Foo bar
+    assets/.htaccess: "# Apache config"
+outfiles:
+    something.txt: Foo bar
+    .htaccess: "# Apache config"
+