views: Preserve 404 and 500 statuses on errors.

Noticed this earlier today while tweaking our Varnish.
templates/universe/comics: Fix unqualified macro name.
templates/universe/comics: Check for comic existence before generating links.

Otherwise the oldest and newest comics (chronologically) will be broken.
config: Disable external templates.

Not necessary with the new architecture.
views: Fix sidebar character list.
template/universe/comics: Link to cast at top.
Fix issue #14
Merge pull request #16 from edunham/master

Documentation and newbie help to make site runnable
Merge pull request #17 from edunham/issue14

Add messages when toggling character's major status
readme typo fix