- Tagged posts
- Collection index

Ref T661

This adds a new editor template that strips away most of the
customization features in the default editor and includes only:

- publishing
- editing
- viewing word count

It also restricts publishing to a user's first collection, so it's
optimized for instances that only allow users to have a single
collection and don't use Drafts.

Ref T680 T677

This shows About, Reader, Log out links on backend user pages when
logged in. It also adds "New post" buttons on the backend pages and
blogs.

This whitelists the HTML5 <audio> element and adds some basic style to
make it look nice.

Closes #132

This adds a small margin around a time element, which makes things look
better when the body of a post starts with a header.

Previously, <h2>s in a post were the exact same size as post titles on
index pages (blog index, tag listing). This fixes that by reducing the
font-size of body h2's. Closes #82.

Along with a recent change to how spaces are output by the
writeas/saturday library, this alters the CSS to make sublists display
correctly, and fixes #27.

- New editor nav
- New backend nav
- Support for drafts
- Different footers on backend