fix failing test on IE11.

turns out the internal escaping stragety can differ between browsers. We
should defer to the browsers defaults
Fix then, than comment typo
Merge pull request #5519 from maximerassi/patch-1

Fix then, than comment typo
Merge pull request #5518 from stefanpenner/IE11

fix failing test on IE11.
Improve wording of documentation for getProperties()
Merge pull request #5520 from mostwanted1976/patch-1

Improve wording of documentation for getProperties()
Fixes the function name

Related to this [PR](https://github.com/emberjs/ember.js/pull/5513).
Merge pull request #5521 from twokul/rename-function

Fixes the function name
Pull in LazyValue and ember-metal integration
Use LazyValue in view helper
Remove relative context Handlebars tests
Use LazyValue in log helper
Register and teardown streams
Use LazyValue in bind-attr helper
Use LazyValue in render helper