[Fixes #2424] App#reset
Eliminate unused variables

I used jshint with '"unused": true' option.
Merge pull request #2481 from tricknotes/eliminate-unused

Eliminate unused variables
Merge pull request #2425 from stefanpenner/app_reset_should_handle_readiness

WIP [Fixes #2424] App#reset
Fixes Ember-data-870 Lazy destruction + App#reset issues

Deleting the container during reset should complete before
we rebuild the container. This fixes an outstanding ember-data
issue -> https://github.com/emberjs/data/pull/870
Merge pull request #2483 from stefanpenner/lazy_destruction_during_reset_is_dangerous

Fixes Ember-data-870 Lazy destruction + App#reset issues
Fixes to MetamorphView's DOMManager replace
Merge pull request #2482 from wagenet/metamorph-replace-fixes

Fixes to MetamorphView's DOMManager replace