[BUGFIX beta] Remove import statement of Router

Since the router.js sync in cf0caa04f625067ec3b4629acdec12c8517df94e,
a `TransitionAborted` rejection is handled by the router (see
http://git.io/Sf38aQ) so there is no need to re-check for this in
the Ember.Test.adapter#exception handler.
Merge pull request #3704 from pangratz/fix/import_of_router_module

[BUGFIX beta] Fix import of Router module in ember-testing package
[BUGFIX beta]  sort guid fallback unconfused by ObjectProxy.

`Em.computed.sort` uses a guid check as a fallback comparator.  In order to
search for items correctly, it also wraps items on removal in an object proxy to
shadow new values with the previous values.

This proxy needs to be sort-equal to the actual object.  To ensure the guid
fallback check treated the item and the proxy as equal, it had a check
`ObjectProxy.detectInstance`.  This check is obviously deficient in the face of
items that might themselves be `ObjectProxy`s, such as `ObjectController`s when
using `@this` as the base array in an `ArrayController`.

This commit creates a local type of `ObjectProxy`, `SearchProxy`, to avoid this
confusion.

Fix #3720.
Merge pull request #3724 from hjdivad/fix-3720

[BUGFIX beta]  sort guid fallback unconfused by ObjectProxy.
[BUGFIX beta] Close #3502 – Fix issue with templateName in Route and render.
Merge pull request #3727 from abuiles/fix_render_template_in_route

[BUGFIX beta] Close #3502 – Fix issue with templateName in Route and render.
[BUGFIX beta] [fixes #3714] PromiseProxy should merely observe promises.

Uncaught exceptions should likely still propogate.
fixes for yuidoc comments
Merge pull request #3731 from twokul/computed-yuidoc-fixes

fixes for yuidoc comments
fixing docs
Merge pull request #3734 from twokul/more-docs-fixes

fixing docs