We used to do it this way, I'm not sure why it was changed.
Our settings files add directories to the path, so we need to
do it here so that names will be importable.

Use super for calling parent __init__ methods

Refactor rake tasks for pylint/pep8

PDF textbooks in Studio

clarify LICENSE

Previously, for a textbook with only one chapter, we allowed that chapter to
not have a title -- under the assumption that it would be shown as a monolithic
textbook, instead of a chaptered textbook. However, the UI doesn't support that
idea, the code was getting a bit messy, and there was no real benefit to the idea
of not having to specify a chapter title. This commit removes that special case,
and ensures that all textbook chapters must have a name and an asset path.

They are the defaults now

But only slightly. Sorry Christina.