Merge pull request #4243 from rjackson/fix_component_tests

[BUGFIX beta] Fix component registration tests under IE8.
Merge pull request #4242 from rjackson/update-ember-dev

Resolve issue with ember-dev using Object.create in teardown hooks.
Merge pull request #4244 from rjackson/fix-qpn-in-ie8

[FEATURE query-params-new] Fix failures in IE8.
[FEATURE ember-routing-bound-action-name]

The `{{action}}` helper will now use a non-quoted parameter and perform
a bound property lookup against the action's target at the time the
event is triggered.

If a non-quoted param is used, but the property lookup returns
`undefined` a helpful assertion is made, and the specified parameter is
used as a plain string action name (thus preventing this from breaking
anyones applications).

Also, cleans up a few unrelated non-quoted uses of `{{action}}` in the
test suite.