Switch back to build view with unsaved story

When a story is initially created, the default route initiates the
template selection view.  Once the template is selected, the default
route should go to the build step, allowing users to toggle between
build and "Story Info" steps, even before the initial save of the
story.

Addresses #579
Trigger initial save of story when featured asset is set

For an unsaved story, trigger the initial save of the story when
the featured asset is set.

Move the updating of the browser path out of ``BuilderView`` and into
``AppView``, allowing the path to reflect the current workflow step
and the app to stay on the "Story Info" workflow step if that's the
step the user was on when the save was initiated.

Make ``FeaturedAssetView`` re-delegate events when showing its
subviews.  This was breaking events in the sub-views.

As part of testing this, I mocked the license HTML endpoint as the
tests were previously making tons of requests to this endpoint for
some reason.

Addresses #579
Add all dependencies as arguments of self-executing anonymous function

Make the code more AMD-ready by passing all dependencies (jQuery,
wysihtml5) as arguments to the self-executing anonymous function that
wraps this module.