When loading a page, we were setting up the Page and PageView state

before loading extension JavaScript bundles. This meant that any page

that wanted to customize the page had to essentially break this bit of

code out into a separate bundle and then manually invoke loading the

bundle ahead of time, which is far from ideal.
We now simply ensure we've loaded this JavaScript before-hand.
This could potentially break some extensions if they assume that the

page is set up first, but JavaScript is always supposed to use

RB.PageManager.beforeRender() or RB.PageManager.ready() for any

page-specific JavaScript code, to be safe.

Tested loading a new Power Pack-provided PageView, and verified it

worked.