Flesh out the coappearances page a bit.
Load angular.js after jquery.js.
Clean up coappear.html a bit.
Get rid of chapter.tpl and replace with chapter.html.

- Use Angular.js client-side templating only. Avoids having to mix server-side and client-side templates, at least for now.
- Wrap coappearance graph and character list in a Bootstrap.js layout and use the same nav bar as on coappear.html.
- Make character list independently scrollable.
- Make coappearance graph statically sized for now to avoid messing up layout.