Allow returned exports in bootstrapping.

This should allow us to upgrade to Q v0.9, which exports the Q()
function, without modification.
Remove RangeController Iterations

The repetition iterations reach directly into the organizedContent of
the contentController.  This makes content controllers simply objects
that translate content to organizedContent and host a selection
property.  They can thus be chained and do not manage a wasteful
iterations array at each stage.
First pass at Flow + Bindings + Template refactor

-   Temporarily disables frustrum culling and visible indexes management
    (indexMap).
-   Refactors the way that the Flow manages its iteration template.
-   Refactors the way flow interacts with iterations, particularly the
    wrapper element.
-   Renames "objects" to "content" on Flow, to align with Repetition
    change.