A big pull request, that has more customization

I could have broken this down into smaller chunks, but it all was related to personal customization.  Big things are

* Added partial to credit myself in all footers, so can change it one place
* Hard link all ``/author`` directly to ``/daniel`` so that can update about me page in ghost
* **nice!** use blog cover if no cover image selected for an article (means i don't have to have an image for every post)
* Minor css tweaks for link underline + more breathing room