Refactored Layout and View, upgraded to latest LM

The Layout object was a simple wrapper over the Layout constructor
instead of extending the constructor itself.  I've patched this to make
it more consistent and removed duplicative methods.  I've also removed
the tests for `removeView` since that is now a built-in method.

The latest LM contains bugfixes and render performance updates that
unforuntately have to be opt-out.  Areas in the source or tests that are
expecting synchronous renders must be patched to work asynchronously to
take advantage.
Upgrade backbone.layoutmanager

Work off Tim's initial commits and adjust to cater for the use of
establish functions in views and routeObjects.
We don't want to immediately render the view. We first want any pending
promises returned from a routeObjects establish and a view's establish
to complete before rendering the view.
delete unused variable
Fix deletion of docs that where selected using select-all

- add docs on page to bulk-delete-collection on select-all-click,
  which also reenables the trash-button
- make AllDocs testable, enable injection for viewMeta

Closes COUCHDB-2291
Fix double-click on design documents in all-docs-list

Closes COUCHDB-2247
fix test

travis was green but outdated