Recently, the js/reviewRequestPage/ directory was creating to house

the models for backing review request page entries. Each model in here

lived in the RB. namespace, with ReviewRequestPage prefixed to the

model name, making the filenames quite long and setting a bad precedent

for future classes. We also had all the view classes living in a

different location using "box" instead of "entry" in the names.
This change begins some cleanup of these directories, helping with

organizing things before some upcoming work on dynamic reloading. The

model filenames are now simpler, chopping off the reviewRequestPage

prefix, and the models themselves now live in a RB.ReviewRequestPage

namespace.
The box views have been moved into js/reviewRequestPage/views/ and

renamed to use the Entry terminology. The base class,

CollapsableBoxView, has been renamed to EntryView, which will be

more suitable given some of its upcoming responsibilities.
These files have also been moved out of the reviews Pipeline bundle

and into a new review-request-page bundle. This will slim down the

diff viewer and file attachment pages a bit. In time, more files will

move to this bundle.

Unit tests all run.
Tested all the functionality of the various types of entries on the

review request page. This included:

Collapsing/expanding boxes (all at once and one-at-a-time)
Loading comments.
Replying to comments.
Viewing status updates.
Viewing and working with content on the change entries.