Remove duplicated notifications

The ones that are used are in index.underscore

COUCHDB-2471
Fix URL paths for Views to be _view not _views

This changes the URL paths for Views within Fauxton for compatibility
with the API URLs.To test, just create/edit a View and confirm the URL
ends with /_view/theViewName not _views/theViewName

Closes COUCHDB-2415
Move Helpers.docs into constants.js

This is a house cleaning ticket. It does a couple of things:
1. Moves the list of URLs stored in Helpers.docs into constants.js
2. Refactors constants to group the (now growing) list into appropriate
groups.

Now there are a lot less hardcoded "magic" strings throughout our
code, yay!

Closes COUCHDB-2474