Cleanup a few multi var assigning declarations.
Merge pull request #5437 from rwjblue/single-var-metal-views

Cleanup a few multi var assigning declarations.
Multiline variable declarations
Merge pull request #5435 from twokul/multiline-args

Multiline variable declarations
[DOC beta] Improve docs on when model hook is called
Merge pull request #5434 from alexspeller/improve-model-hook-docs

Improve docs on when model hook is called
Only instrument views with `instrumentDetails` defined
Merge pull request #5439 from mmun/instrument-details

Only instrument views with `instrumentDetails` defined
Renderer reuses RenderBuffer instance
Remove dead code and polyfill for containsElement.
Merge pull request #5442 from rwjblue/remove-dead-contains-code

Remove dead code and polyfill for containsElement.
micro-perf: out of 1650/1800 calls superMethod is undefined.
perf: only wrap methods that container _super in the function body

Some statistics:

50 / 122 only 40% of methods currently being superWrapped need to be.

stress app boot: superWrapper calls before: 48746 after: 21094

This seems to reduce the cost of total consumed superWrapper time by the same ratio (about 40%) but also has have a net positive impact on all functions that now don't need go through the wrapper. This allows those traces to be optimized and further inlined.

Another nice bonus, is that methods not needing to be wrapped are also now much more debuggable.
Merge pull request #5443 from stefanpenner/micro-perf

micro-perf: out of 1650/1800 calls superMethod is undefined.
[Bugfix beta] just because hasOwnProperty isn’t present doesn’t mean we shouldn’t use Object.prototype.hasOwnProperty for a consistent and absolutely correct outcome.
Merge pull request #5445 from stefanpenner/more-correct-clone

[Bugfix beta] more accurate clone when dealing with null prototype objects
Prevents arguments from leaking
Remove metamorph.js
Merge pull request #5446 from mmun/remove-metamorph

Remove metamorph.js
Merge pull request #5441 from mmun/reuse-buffer

Renderer reuses RenderBuffer instance